View Full Version : Skully's bionic-man .300 Blackout carbine
So after starting a .300 Black carbine, while I waited to get the barrel in for that I built a .300 Black pistol, then I decided, screw the carbine stick with the pistol, then I decided NO I need a carbine....................... I am about as bad as a women shopping for shoes. Made up my mind (for now) and decided it was going to be a killer .300 Blackout carbine build. This is my 3rd .300 Blackout build (the others were sold off in parts) so like the million dollar man (not meaning I spent that much) I am going to build it stronger, lighter, and faster.
So this is my bionic-man (actually going to name it "BLACK & TAN" see catchy; .300 Blackout chambered and the gun is FDE/tan, also like the drink) .300 blackout carbine, Post #1 (still waiting for parts for the upper.)
Picked up Basic PALMETTO STATE ARMORY complete lower.
Added BCM gunfighter grip, KAC trigger guard, Noveske QD end plate, and a Vltor IMOD clubfoot stock. Also have a Phase 5 battery assist device on it. (not pictured.)
More to come..................
TriggerHappy
06-01-2012, 17:50
Just throw an 8" and you will have both!![Muaha]
Just throw an 8" and you will have both!![Muaha]
SBR registration first on the lower then..................... I am a ways from that though.
[Tooth]
What are the plans for the upper?
What are the plans for the upper?
I have a VLTOR MUR upper w/ forward assist, VLTOR CASV-E handguard, Tango Down stubby grip, Spike's tacitcal BCG, BCM Gunfighter charging handle, ARMS rear MBUS sight, VLTOR flash hider, VLTOR flip up front sight, CORE15 16" carbine barrel, Kies Adjustable low pro gas block.
Then I have a Trijicon Reflex RX-06 on an ARMS QD mount and soon .....maybe later a 2-7x32 scope with quick detach mount.
how do you like that grip???
what made you go the 300 blk route?
how do you like that grip???
I love that grip, I like MOE + and I like the Tango Down G17, but the angle the BCM Gunfighter grip gives you FEELS so much more comfortable..... Just wish their FDE matched MAGPULs and Vltors............a couple shades lighter so doesn't quite match.
what made you go the 300 blk route?
What is not to love about the .300 Blackout? Super simple to change your AR platform, no special mags, no special parts other than the barrel. You get to send a much larger projectile down range with little retraining on shooting it. Overall just cheaper to run than other calibers in the AR platform.
Same bolt and everything? I was gonna go 6.8 on my next upper build however the more I read the more I like this cartridge
Same bolt and everything? I was gonna go 6.8 on my next upper build however the more I read the more I like this cartridge
.300 blackout uses the same case as the 5.56 just cut down so this allows you to use the same bolt and same magazines, only thing you need to change from the basic 5.56 is the barrel.
TriggerHappy
06-02-2012, 14:23
SBR registration first on the lower then..................... I am a ways from that though.
[Tooth]
Obviously form 4 applies.
Hey Skully, You familiar with any manufacturers that make 300 BLK bull barrels, say in around 20" length?
Hey Skully, You familiar with any manufacturers that make 300 BLK bull barrels, say in around 20" length?
20" is too long from what I have read. 16" is about the sweet spot for max velocity
Hey Skully, You familiar with any manufacturers that make 300 BLK bull barrels, say in around 20" length?
From my net research the way .300 blackout works is very powder efficient and works best in short to mid range barrels. Another thing I heard is the .300 can be picky with gas port/systems. Why the largest length you see common is 16" with a carbine gas. Ballistically it is equivalent to a 5.56 24" barrel or something like that. Most of what I heard/read is a 20" barrel is a waist in .300 blk.
This new barrel I got has a larger gas hole in carbine system to help when using lower powered subsonic loads to help it cycle. Why I did an adjustable gas block in case it cycles too HARD or early now with supersonic loads.
I believe Black hole weaponry had an 18" with a mid length gas system listed. I have never in my searches found a 20" barrel. HOSER I think said in a post before the great crash he has a 20" barrel but couldn't remember if it was .300 whisper or Blackout???
From my net research the way .300 blackout works is very powder efficient and works best in short to mid range barrels. Another thing I heard is the .300 can be picky with gas port/systems. Why the largest length you see common is 16" with a carbine gas. Ballistically it is equivalent to a 5.56 20" barrel or something like that. Most of what I heard/read is a 20" barrel is a waist in .300 blk.
This new barrel I got has a larger gas hole in carbine system to help when using lower powered subsonic loads to help it cycle. Why I did an adjustable gas block in case it cycles too HARD or early now with supersonic loads.
I believe Black hole weaponry had an 18" with a mid length gas system listed. I have never in my searches found a 20" barrel. HOSER I think said in a post before the great crash he has a 20" barrel but couldn't remember if it was .300 whisper or Blackout???
I was just looking for a bit more velocity than you would get from the shorter barrels. I know that goes against the kind of PDW/MP5-ish role that I've seen for a lot of the 300 BLK builds. I have no idea though the ideal twist rate for a 20" etc. Just curious if you'd seen anything since you've built a few of these.
Hoser said this in another post:
Either work. I think the Whisper is more accurate, but the Blackouts different throat lets you run more pressure/higher velocity.
Spook (a member here) built my latest 300 Whisper upper. Incredibly accurate and with a 20 inch barrel I can get some impressive velocities. I dont need no stinkin blackout...
I'm tending to stay away from the whisper since I don't reload and ammo seems less available than for the BLK. However, he's got a 20" barrel so that's why I asked.
20" is too long from what I have read. 16" is about the sweet spot for max velocity
Bogie what DFBrews said, the difference in velocity between a 9' and 16" barrel is not at all very much. (why the blk is very handy to have in short barrels.)
I read in a couple places the .300 BLK burns its powder out early so a 20 barrel with rifle or mid length system might not cycle correctly. AAC's own .300 black website gives its effective range at 460 meters with a 16" and 430 with a 9" not much difference.
This is a quote from someone on another forum;
300 BLK does gain velocity up to and past a 30 inch barrel.
http://img211.imageshack.us/img211/7426/300blk.jpg
Barrel length has virtually no effect on which powder to use to get the most velocity. I know it is commonly believed to be the case, but it just does not really work that way. It does a little, but primarily whatever powder gives the most velocity in a 6 inch barrel with probably also give the most velocity in a 24 inch barrel. This is because the powder that reaches peak pressure and velocity for any given bullet weight does so within the first inch of bullet travel.
300 BLK will gain about 65 fps per inch at around 9 inches, 43 fps per inch at around 12 inches, 28 fps per inch at around 16 inches, 21 fps per inch at around 20 inches, 17 fps per inch at around 24 inches, and 12 fps per inch at around 30 inches. You just need to decide where you want to stop.
"So there's no difference in velocity and energy between 16" to 20" other than additional barrel weight?"
2400 fps vs 2491 fps.
1403 ft-lbs vs 1515 ft-lbs.
"Will the 300AAC reach out to 300 yards with enough energy to hunt with?"
Yes - energy and bullet performance is fine at 300 - but the drop at 300 is about 11 inches from a 200 yard zero - so if you want to shoot beyond 300 yards - you will have to start to do scope adjustments or holdover.
If you want to hunt long range - 308 is the way I would go.
"If so in what configuration?"
A 9 inch barrel is good for up to 300 yards for hunting based on bullet performance. A 6 inch barrel I would limit to 200 yards.
"If not what is the max effective range?"
For hunting I would say 300 yards. For military use and by M4 standards based on hit probability, it is 440 meters from a 9 inch barrel and 460 meters from a 16 inch barrel. This is because those are the ranges for which the wind drift and drop matches the M4 at its stated max effective range.
This place will make you anything you want up to 18" barrel but not sure if Mid length gas system will work effectively? TACTICAL AMMUNITION (http://www.ar-15.co/forums/%22So%20there%27s%20no%20difference%20in%20velocit y%20and%20energy%20between%2016%22%20to%2020%22%20 other%20than%20additional%20barrel%20weight?%22%20 %202400%20fps%20vs%202491%20fps.%201403%20ft-lbs%20vs%201515%20ft-lbs.%20%20%22Will%20the%20300AAC%20reach%20out%20t o%20300%20yards%20with%20enough%20energy%20to%20hu nt%20with?%22%20%20Yes%20-%20energy%20and%20bullet%20performance%20is%20fine %20at%20300%20-%20but%20the%20drop%20at%20300%20is%20about%2011%2 0inches%20from%20a%20200%20yard%20zero%20-%20so%20if%20you%20want%20to%20shoot%20beyond%2030 0%20yards%20-%20you%20will%20have%20to%20start%20to%20do%20scop e%20adjustments%20or%20holdover.%20%20If%20you%20w ant%20to%20hunt%20long%20range%20-%20308%20is%20the%20way%20I%20would%20go.%20%20%22 If%20so%20in%20what%20configuration?%22%20%20A%209 %20inch%20barrel%20is%20good%20for%20up%20to%20300 %20yards%20for%20hunting%20based%20on%20bullet%20p erformance.%20A%206%20inch%20barrel%20I%20would%20 limit%20to%20200%20yards.%20%20%22If%20not%20what% 20is%20the%20max%20effective%20range?%22%20%20For% 20hunting%20I%20would%20say%20300%20yards.%20For%2 0military%20use%20and%20by%20M4%20standards%20base d%20on%20hit%20probability,%20it%20is%20440%20mete rs%20from%20a%209%20inch%20barrel%20and%20460%20me ters%20from%20a%2016%20inch%20barrel.%20This%20is% 20because%20those%20are%20the%20ranges%20for%20whi ch%20the%20wind%20drift%20and%20drop%20matches%20t he%20M4%20at%20its%20stated%20max%20effective%20ra nge.)
The going twist rate is 1:8 but have heard of 1:7........................................
Not sure if anything above 16" is going to gain you anymore accuracy than you already have. I would do more research on the barrel length and gas system, you definitely do not want a single shot rifle. :D
are you using a standard cabine buffer/recoil spring setup on these builds??
are you using a standard cabine buffer/recoil spring setup on these builds??
There is no special requirements that I am aware of. The basic 5.56 carbine buffer and spring. I am actually using a Spike ST-2 on mine but have heard no negatives or special needs required.
Thanks for the insight guys. Skully your link didn't work. Could you please repost? Looks like there's a good case for a 16" barrel. I'd still like a heavy barrel for stiffness.
A few barrels I found...
Here's one at Model 1... (http://model1sales.com/index.cfm?fuseaction=category.display&category_id=657&CFID=22310451&CFTOKEN=12327380)
These Wilsons are nice but mostly out of stock (http://shopwilsoncombat.com/300-AAC-Blackout/products/397/)
I may go for this one or wait for a 16" (http://shopwilsoncombat.com/Wilson-Combat-Match-Grade-Barrel-300-AAC-Blackout-Recon-Tactical-18-1-8-Twist-Stainless-Fluted/productinfo/TR-300RC18F/)
I get the impression that the 1/7 twist is better for subsonic loadings. Also, Wilson shows a test target that looks like the barrels are at least MOA or better. Although, they don't say which barrel or load...
I'd be shooting mostly supersonic. But the subsonic would be fun for plinking.
Thanks for the insight guys. Skully your link didn't work. Could you please repost? Looks like there's a good case for a 16" barrel. I'd still like a heavy barrel for stiffness.
A few barrels I found...
Here's one at Model 1... (http://model1sales.com/index.cfm?fuseaction=category.display&category_id=657&CFID=22310451&CFTOKEN=12327380)
These Wilsons are nice but mostly out of stock (http://shopwilsoncombat.com/300-AAC-Blackout/products/397/)
I may go for this one or wait for a 16" (http://shopwilsoncombat.com/Wilson-Combat-Match-Grade-Barrel-300-AAC-Blackout-Recon-Tactical-18-1-8-Twist-Stainless-Fluted/productinfo/TR-300RC18F/)
I get the impression that the 1/7 twist is better for subsonic loadings. Also, Wilson shows a test target that looks like the barrels are at least MOA or better. Although, they don't say which barrel or load...
I'd be shooting mostly supersonic. But the subsonic would be fun for plinking.
Your welcome. :)
The link was working when I linked it? Just look up google the tactical ammunition and their main website should come up.
The CMMG barrel was very nice as well, if you can find it in stock. I had originally the model 1 when the CMMG had come in and sold it. Nice barrel the finish was a little plain.
Every 16" barrel I held looks and feels like a heavy barrel.
SURPLUS AMMO (http://www.surplusammo.com/surplus-ammo-arms-16-carbine-h-bar-300-blackout-teflon-coated-stainless-steel-1-8-ar-15-barrel/) also has one for $200 in stock.
The Wilson would be purdy.........
Got the missing couple pieces of my upper re-build.
It didn't go together without some trouble and disappointments.
First; the Kies Adjustable Gas block while being cheap, isn't perfect. It was a really tight fit in fact a little too tight. ( I would rather have it tight than lose I guess) I had to be a little more persuasive to get it on, doing so I scratched my finish on the barrel. Then the pin for the gas tube I first tried to knock it out and it was not budging. Looking closer at it is was a bolt with Allen head. THE TINIEST Allen I had. As I was screwing it in it wouldn't line up right with the tube and I had to play with the hole a little. Then the Allen wrench broke wallowing out the end........it was 80% screwed back in to the other side. I said F it for now, I will need to vise grip it or drill it out and put a regular pin back in. The last thing is the actual "adjustable" part, it is nothing more than the same screw/bolt they use to lock down the gas block, but it is super easy to turn....................too easy. I foresee it vibrating out or in. Will have to test it with supersonic and subsonic to find the right spot and then lock it in place with Loc-Tite.
Second trouble was as I was playing I knocked off my receiver block on the floor and it broke, still usable but urked me none the less as it was part of a kit that cost me $80.
Overall it looks great and I am done other than the redos/fixes and then testing it out. I did weight it and it comes out to 8lbs 5oz without a loaded magazine, which is 30oz lighter than its previous configuration.
I somewhat fixed my gas block and got inspired to tweak the cosmetics and painted the barrel, plus marked the mags. I also found it to fit in my nice breakdown case with all the mags and my Cold steel blade.
I have been contemplating this, who thinks I should strip my lower and paint it FDE??????
ThunderSquirrel
06-07-2012, 12:39
Do it! Just prep the heck out of it.
And don't forget to tape off the pivot and take down pin holes... that's experience talking.
http://i523.photobucket.com/albums/w353/crowldogg3/IMG_0143.jpg
Do it! Just prep the heck out of it.
And don't forget to tape off the pivot and take down pin holes... that's experience talking.
Did you use the DURA COAT shake and spray kit or there basic kit or someone elses?
ThunderSquirrel
06-11-2012, 14:09
I used Brownells Aluma-Hyde II in their "Coyote" color, since that was the closest to FDE they had. I bought it up at Bowers. I sprayed a Lower, Upper, Forend and Buffer tube and still have 3/4 of a can left, so one can is plenty.
I sprayed it after i degreased the heck out of it on a hot day. Using a heat gun and light coats like brownless suggests. Took maybe an hour or two to get it all done.
Takes a while to cure, but it looks pretty decent for the first gun I've ever refinished. Learned a lot, hence the pivot pin/ takedown pin tip.
Went out and tested my virgin 300 BLK. I put around 100+ rds through it successfully. Once dialed in it was very accurate for what I was using, a Trijicon Reflex sight at 50 and 75 yards, some bench and some standing.
When I first dialed it in at 50 yards with the Trijicon Reflex:
http://i394.photobucket.com/albums/pp29/SkullyandRoxy/firearms/300blktestrun2.jpg
I did run into some problems, feeding problems.
Out of 100+ rds I put through the rifle, I had 10 lost due to this.
They would mis-feed, causing deformation to the case making them un-usable afterwards.
I first switched the mag thinking that was it, it was not, switched mags 3 times. I went to different ammo, UMC 115gr, Atlanta arms 125gr ballistic tip, and PWN 147gr range rounds. Still had problems, all the same thing, got jammed loading into the chamber deforming it. Two of the rounds mis-fed when I put in a new mag and charged the rifle, so I was ruling out a cycling issue for now.
The 100+ rds that did fire correctly I kept the empty cases and looked through them. They were what I would expect from a fired case, no unusual deformation.
Another minor issue, not sure if it is the same problem causing my mis-feeding, but I also had 2 rounds failure to extract after firing and really hard to get the BC to open.
Overall it was very randomly spaced out through my shooting session. The Rifle would work great for 20rds then mis-feed, WTF!?????
The BCG also seems to be in working order and see no issue with it yet. I also tested by sticking a round in the chamber it is "very" tight. I was thinking maybe just need to work the rifle in, but wondering if there is something I am overlooking?
Before I finished shooting I removed the BCG and lubed everything. The last 25rds went through no problems, but not satisfied that was my problem, I wanted to continue to put some rounds through it, but I ran out of session time.
I hate having problems I can not instantly identify and it bugs me to no end. [Rant1]
See below the damage to the rounds; (bottom shows the deformation to the case.)
http://i394.photobucket.com/albums/pp29/SkullyandRoxy/firearms/300blkprobs2.jpg
Anyone have some wisdom to share?
What kind of magazines were you using? When you say you tried several magazines were they all the same make/model?
What kind of magazines were you using? When you say you tried several magazines were they all the same make/model?
Yeah, 2 were older PMAGs, 2 were brand new Windowed PMAGs. I think I see what your thinking, maybe the MAGPUL's don't like 300 BLK?
I have seen/read some test articles on 300 BLK where they were using PMAGs. I have not seen any red flags around the net on this as PMAGS are pretty popular.
I will have to pick me up some USGI mags and test with those as part of my trouble shooting.
If we get to make it out next Friday I have some GI mags you can use to see if they work before you buy any. I have some with the newest generation follower (the tan or gold one) and some with the Magpul followers. You're welcome to put rounds through them if you want to see how they function.
[Beer]
If we get to make it out next Friday I have some GI mags you can use to see if they work before you buy any. I have some with the newest generation follower (the tan or gold one) and some with the Magpul followers. You're welcome to put rounds through them if you want to see how they function.
[Beer]
Thanks! [Beer]
I will fiddle with it this week and see if I can visually see anything else that might be the cause.
I am not an expert by any means but I can usually figure it out pretty good.
Why I came to this place to call home! [Flower]
I did run into some problems, feeding problems.
Out of 100+ rds I put through the rifle, I had 10 lost due to this.
They would mis-feed, causing deformation to the case making them un-usable afterwards.
I first switched the mag thinking that was it, it was not, switched mags 3 times. I went to different ammo, UMC 115gr, Atlanta arms 125gr ballistic tip, and PWN 147gr range rounds. Still had problems, all the same thing, got jammed loading into the chamber deforming it. Two of the rounds mis-fed when I put in a new mag and charged the rifle, so I was ruling out a cycling issue for now.
The 100+ rds that did fire correctly I kept the empty cases and looked through them. They were what I would expect from a fired case, no unusual deformation.
Another minor issue, not sure if it is the same problem causing my mis-feeding, but I also had 2 rounds failure to extract after firing and really hard to get the BC to open.
Overall it was very randomly spaced out through my shooting session. The Rifle would work great for 20rds then mis-feed, WTF!?????
The BCG also seems to be in working order and see no issue with it yet. I also tested by sticking a round in the chamber it is "very" tight. I was thinking maybe just need to work the rifle in, but wondering if there is something I am overlooking?
Before I finished shooting I removed the BCG and lubed everything. The last 25rds went through no problems, but not satisfied that was my problem, I wanted to continue to put some rounds through it, but I ran out of session time.
I hate having problems I can not instantly identify and it bugs me to no end. [Rant1]
See below the damage to the rounds; (bottom shows the deformation to the case.)
http://i394.photobucket.com/albums/pp29/SkullyandRoxy/firearms/300blkprobs1.jpg
http://i394.photobucket.com/albums/pp29/SkullyandRoxy/firearms/300blkprobs2.jpg
Anyone have some wisdom to share?
Just one other thing that I noticed. The pink tip ammo used to have a problem in the manufacturing process that would produce a fine little brass ring around the case throat. The little ring would get jammed in the chamber throat and caused jamming and cycling problems. I think that they fixed the problem, and I have never encountered it in person, but there was a thread about it a couple months ago on 300blktalk.com. You might look at your ammo carefully and see if you see any of the little brass rings. Once it is jammed in the chamber, it would cause short cycles on the previous round and the bullets in the pics looked like they were having the same feeding problems that yours are having. I will look around and see if I can locate the thread.
Here it is:
http://www.300blktalk.com/forum/viewtopic.php?f=128&t=78221&hilit=pink+tip
I guess that I misread the thread the first time, but it is still relevant because I guess there are some barrels out there with tight chambers that are shaving a copper ring off of the bullet as it is being driven in by the BCG. Still might look into it if factory ammo feels "tight".
Here it is:
http://www.300blktalk.com/forum/viewtopic.php?f=128&t=78221&hilit=pink+tip
I guess that I misread the thread the first time, but it is still relevant because I guess there are some barrels out there with tight chambers that are shaving a copper ring off of the bullet as it is being driven in by the BCG. Still might look into it if factory ammo feels "tight".
I looked the post over that you linked. I will have to inspect the barrel closer, but I did not come across any of those rings during shooting? I also started having problems 1st mag with the UMC115gr. I didn't use the Atlantic 125 gr pink tip until the end of my session and the last 25 rds worked beautifully; however, mention of the "tight" chamber definitely matches what I found.
Will clean it and a get a better light down the barrel/chamber.
I am going to PM BP anyway and pick his brain.
Thanks Danimal! [Beer]
BPTactical
07-15-2012, 10:09
I would try different mags first. Usually the majority of feed related issues can be absolved with different mags.
I can check the headspace, that will let us know if the chamber is snug.
I would try different mags first. Usually the majority of feed related issues can be absolved with different mags.
I can check the headspace, that will let us know if the chamber is snug.
Unfortunately I reluctantly sold all my surplus USGI mags. All I have is PMAGS.
Update: I took the rifle apart and thoroughly clean it, inspected it and lubed the crap out of it. Found NO little "rings" in the chamber so for shits and giggles took two PMAGS and was going to manually cycle some rounds through. One brand new and the other an older one.
Upon the 1st round out of each of the mags got it to mis-feed/Jam.
Took some better photos of it "stuck" and the damage to the case.
It is like inserting a stick in a tube with very little tolerance at a slight angle, gets wedged sort of, the lip of the case catches and deforms as it is going into the chamber.
See for yourself;
http://i394.photobucket.com/albums/pp29/SkullyandRoxy/firearms/300BLKJam2.jpg
http://i394.photobucket.com/albums/pp29/SkullyandRoxy/firearms/300BLKJam1.jpg
Would like to try a regular USGI/ other others and see if the PMAGs are the issue before next Friday. Maybe go check out Jax outdoors for some cheapies.
The way the round is fed it be angling up "too" much. At the shooting session yesterday it ony did it 10 times out of the 100+ that cycled fine, weird?
BTW Thanks BP!!! [Beer]
I have found some posts/comments on the firearm blog and on arf.com where some builds have had issues with pmags and 300 blk. Although responses were mixed some claiming no issues, some talking about modifying their pmags.
I guess I will try another brand to rule out mags. So frustrating.......... :)
You're welcome to try some of my GI mags. If you need them before next weekend just shoot me a PM and we'll work something out.
Man I hope that I do not have that problem with my p-mags. Glad that was the only issue though. I am going to get out and but my first test loads through my new upper this weekend. I guess that it is a good idea to bring a variety of mags.
Man I hope that I do not have that problem with my p-mags. Glad that was the only issue though. I am going to get out and but my first test loads through my new upper this weekend. I guess that it is a good idea to bring a variety of mags.
You putting together a 300 BLK DAMIMAL???
I have had no problems with PMAGS and 5.56.
My problem with PMAGS and 300 BLK (I am assuming until final testing) is not common and I am in the minor 5 percentile as I have found over the web searching for similar issues. I am thinking there has got to be other minor factors contributing to this issue, or combination of different manufactures for barrels, variations of upper and lower receiver tolerances, etc.
Yup, I built one last month but due to the fire ban I have yet to shoot it. I love my pmags for 5.56, but I would be bummed if they are sub par for 300 BLK. I also need to buy some 5 round mags for hunting because I think I might take it on a deer hunt next year.
Yup, I built one last month but due to the fire ban I have yet to shoot it. I love my pmags for 5.56, but I would be bummed if they are sub par for 300 BLK. I also need to buy some 5 round mags for hunting because I think I might take it on a deer hunt next year.
Who's barrel did you go with or did you buy a complete upper?
Skully, I'm in the process of build my 300 BLK, Wilson 16" barrel, I've heard and been told that Lancer Mag's work great for the 300 BLK, don't know how true it is but I due have a few of them.
Skully, I'm in the process of build my 300 BLK, Wilson 16" barrel, I've heard and been told that Lancer Mag's work great for the 300 BLK, don't know how true it is but I due have a few of them.
I saw/read that somewhere as well, with someone else having probs with PMAGs. What a weird problem...........
I am going to try some different USGI mags with various generations of followers to see which one works 100%. I know that newer mags for 5.56 have the enhanced/modified follower (green then brown the newest) and that might be the problem that I am dealing with.
Well tried 4 different mags; 1 w green follower, 2 w magpul followers, and 1 with a brown follower. Some 30 rds, some 10 rds, some 20rds in the mags. (testing to see if 30 rds in a mag was causing it.
First two rounds went through, then it jammed with each mag, 4 times. I gave up.
BP is going to check out the barrel/chamber this next week.
:(
Let me know when you get it back if you want to go out and try it again. [Awesom]
Let me know when you get it back if you want to go out and try it again. [Awesom]
Yeah definitely!
Thanks!
Who's barrel did you go with or did you buy a complete upper?
I finally went with this barrel because I got tired of waiting for the Wilson to get back in stock anywhere:
http://www.midwayusa.com/product/211944/ar-stoner-barrel-ar-15-300-aac-blackout-762x35mm-medium-contour-1-in-8-twist-16-stainless-steel
And I built my own with a BCM upper. The BCG is also BCM, and I have a carbine length free float tube.
Well tried 4 different mags; 1 w green follower, 2 w magpul followers, and 1 with a brown follower. Some 30 rds, some 10 rds, some 20rds in the mags. (testing to see if 30 rds in a mag was causing it.
First two rounds went through, then it jammed with each mag, 4 times. I gave up.
BP is going to check out the barrel/chamber this next week.
:(
I am super pissed too. I went out shooting this weekend finally and I was having every type of feeding problem with PMAGS. I never got through a full mag without a misfeed. I have some more work to do still because I was shooting reloads and that might have affected the cycling.
But I am pretty sure my chamber is too tight and it is causing extraction problems. About half way through my supersonic reloads ( 125 grain Nosler ballistic tip moving at 2100 fps) I had a round jam while being chambered. It was sticking out about 1/4" and the bolt was locked on. I could not drive it in with the forward assist, so I called it a day and went home. It took about an hour to drive the round out after I soaked it as best as I could with WD-40. I was hoping the WD would both help it come out and render it inert. The round finally came out after I drove it out from the barrel end using a cleaning rod from a shotgun.
The brass that I was using was a mix of once fired BLK and some converted .223. I have full length re-sized all of it prior to loading it up, and just checking some of the other brass for fit in the chamber about 50% of them do not drop in without some force which leads me to believe that the chamber is too tight. I am going to order some factory unfired brass, re-size it in my dies and see how it fits. Let me know if they find anything with your upper, also let me know what it costs to fix it if need be.
I am super pissed too. I went out shooting this weekend finally and I was having every type of feeding problem with PMAGS. I never got through a full mag without a misfeed. I have some more work to do still because I was shooting reloads and that might have affected the cycling.
But I am pretty sure my chamber is too tight and it is causing extraction problems. About half way through my supersonic reloads ( 125 grain Nosler ballistic tip moving at 2100 fps) I had a round jam while being chambered. I am going to order some factory unfired brass, re-size it in my dies and see how it fits. Let me know if they find anything with your upper, also let me know what it costs to fix it if need be.
Shite dude that sucks to hear. Misery loves company eh? Sounds like the same problems I have. Was suppose to get a hold of Bert today. I have some 115 UMC factory ammo if you want to borrow 20 rounds or so you can go shot some through it to see if it is you reloads. I have this feeling if you are having the same issues as me and not sure if your reloads is the problem.
Hopefully this won't be a big fix for either of us :(
So I emailed the company who I bought this 300 BLK barrel from. I explained what it is doing, sent them the picture and what I have done to test. I explained before I have to put out money to BP to fix what I shouldn't have to want to see if they will do something if anything.
I am wondering since they are a fairly new company maybe they will back up their stuff.
[Coffee]
I guess I will see?
Ran across this...apparently OAL needs to be adjusted for different bullets because 5.56 mags have i ridge that contacts the case...on 300 blk it contacts the bullet,this is from AAC who developed 300 blk...
http://www.defensereview.com/300-aac-blackout-300-blk-7-62x35mm-heavy-supersonicsubsonic-rifle-cartridge-for-military-special-operations-applications-will-it-fly/
Ran across this...apparently OAL needs to be adjusted for different bullets because 5.56 mags have i ridge that contacts the case...on 300 blk it contacts the bullet,this is from AAC who developed 300 blk...
http://www.defensereview.com/300-aac-blackout-300-blk-7-62x35mm-heavy-supersonicsubsonic-rifle-cartridge-for-military-special-operations-applications-will-it-fly/
That might work for DANIMALs issue with his reloads, but I was using 3 different brand's factory loads, not hand loads.
As new as 300blk is, you might check the factory loads for OAL based on bullet type?
As new as 300blk is, you might check the factory loads for OAL based on bullet type?
I was just thinking that to see, I have 3 different manufactures ammo would be interesting to see if they fall in spec.
I actually signed up at 300blk talk the company I bought the barrel from has a company thread on there.
Yeah, I noticed on the AAC site, they seem to promote PMAGS for the 300 blk. The guidance is to make sure the bullets are seated to where the ridge contacts the bullet where it is only .25 inch in diameter if I read that correctly?
I got a response back concerning my barrel. It is the first they have heard of it. They want me to send in the barrel and they will send me a NEW one! That to me speaks a lot about a companies customer service, and they have earned my respect. Specially a barrel that I ran 100 rds down the tube.
I guess it will take a couple weeks to get the new one back, but this chapter is over with. I decided to turn this build into a 14.5 pinned middy and get me something in .308 instead, whether it will be a Ruger scout rifle or an LR308.
Selling off my stock of ammo in 300 blk and as soon as I get the new barrel sell it off as well. Might do a 300 blk upper later on to go alongside one of ARs. who knows.....[Tooth]
dwalker460
08-12-2012, 11:49
Skully are you still thinking of selling that new barrel when it comes in? If so I am very interested, shoot me a PM if you like.
I got a response back concerning my barrel. It is the first they have heard of it. They want me to send in the barrel and they will send me a NEW one! That to me speaks a lot about a companies customer service, and they have earned my respect. Specially a barrel that I ran 100 rds down the tube.
I guess it will take a couple weeks to get the new one back, but this chapter is over with. I decided to turn this build into a 14.5 pinned middy and get me something in .308 instead, whether it will be a Ruger scout rifle or an LR308.
Selling off my stock of ammo in 300 blk and as soon as I get the new barrel sell it off as well. Might do a 300 blk upper later on to go alongside one of ARs. who knows.....[Tooth]
Mine was the barrel too. I sent it in, had it specked and it failed. So they sent me a new one and it is on there now and seems to work much better. I had two FTE failures in the 60 rounds that I fired. They were the 4th and 8th round. After that there were no problems to speak of. It seemed to shoot VERY accurately with both hand loads and factory ammo. I was a little surprised the groups were better than my .223 loads that I have developed for plinking with pulled 62 grain bullets and these were just arbitrary loads to find desired velocities. I was shooting 1.5 - 2 inch groups at 100 yards. I am interested to see how good of a group that I can get. I am glad that there was a point problem and it seems to be solved.
I am bummed to hear that you are getting out of the .300 BLK game. I am setting up my NFA trust here soon and this bastard is going to be so quiet, so accurate, and so awesome.
Mine was the barrel too. I sent it in, had it specked and it failed. So they sent me a new one and it is on there now and seems to work much better. I am glad that there was a point problem and it seems to be solved.
I am bummed to hear that you are getting out of the .300 BLK game. I am setting up my NFA trust here soon and this bastard is going to be so quiet, so accurate, and so awesome.
What are the odds that two of us from two different manufactures had issues with 300 BLK barrels?????
I am glad you got yours solved as well.
I still believe in 300 BLK, love the concept, but I have a certain agenda for my ARs and don't need 3 different calibers right now, want to stock up on 5.56 and 308. Need/want something in a 30 cal to use as my one rifle concept for camping/wheeling and you cant much more mainstream than 308.
I will get me back a 300 BLK but like you I am thinking of suppressor and SBR.....next year maybe. [Tooth]
I will get me back a 300 BLK but like you I am thinking of suppressor and SBR.....next year maybe. [Tooth]
You get that one together and you will definitely be getting an invite to go shooting. [Awesom]
So round up I sold off my 300 BLK stock and dived into a 308 AR instead.
This rifle is still around, as the beauty of a 300 BLK is it is just the barrel.
I got a Adams Arms 14.5 barrel in 5.56 and had BP pin on a spare flash hider, then I got a little artsy fartsy with some paint, then I decided instead of building "another" AR for the wife I would give her this one and she requested all black, go figure.
It is still a bionic-man carbine just not in 300 BLK. [Coffee]
Have is a pic with my wife's hands holding it;
http://i394.photobucket.com/albums/pp29/SkullyandRoxy/firearms/DSCN0484_zpsb2314c32.jpg
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