Ar Help

[littlered]

Anyone ever had a feeding problem with their AR. I took mine out for the first time this past weekend, it was a build with DPMS lower, standard 18" A2 Upper. But what it was doing is, load a round and then it wasn't picking up the next round, but sometimes it would. I was able to get it to pull 5 rounds and then the next 6-8 I would have to manually rack it, and then it would fire a few and stop again. I'm looking for any suggestions
Oh I did try 3 mags, 1 colt, 1 Bushmaster, and one new one, and it still had the same problem with all three.

[The Extractor]

what type of stock and recoil spring and spring weight are you using ?

[littlered]

just a plain stock, and i have no idea on what kind of spring, this is all new to me so

[The Extractor]

Is it clean and lubricated ? brand new, or used parts in the upper ? is it completely ejecting the empty shell ? What type of ammo ?

[Marlin]

The mags all seat well? Send Me a PM,, I could look at it...

[Irish]

My friend Pat had the exact same issue with his DPMS last weekend as well. New rifle & everything. I am curious to see what the cause is... What type of followers were in your mags? I have got some magpul anti tilt followers in mine & they really do not tilt! The green ones still do from time to time. I suspect that the magazine housing may be a little tight on Pats rifle (being brand new) it might not hurt to release and reload a couple twenty times to help smooth things over a bit, although this is just speculation. I have a few different kinds of Magazines and followers you can try if you think that might be the cause.
Let me know... I am in Thornton.

[DOC]

My AR had a problem with FTF (failure to Feed) turns out it was really dirty though.

[roman gnome]

I would take Marlin up on his offer, he could save you alot of time & money on trouble-shooting. JMO Good luck.

[BadShot]

I'm speculating, but are you saying you assembled the upper yourself or? This sounds like a gas issue. Meaning not enough is getting back to the chamber to cycle the bolt. If you've got a rifle length buffer and spring you should be fine there - specs can be found via google -

[mightymouse]

Gas issue. Possibly debris in the gas key like what happened to mine.

[littlered]

I got this rifle from a guy in a trade and the upper wasn't completely assembled. I had to get a bolt and carrier, forward assist, charging handle and trap door/ dust cover and install them myself. I also checked the head spacing on it too. The ammo was new Remington 223 55gr brass, but there’s no grantee that it was good I have had some bad one before in other calibers but not often. Other then that the rifle was fully clean and lubed. I will send a pm to Marlin and see what he has to say. Thanks

[Marlin]

PM sent..

[DOC]

The gas key could loose and or not sealed properly. I heard that when a gas key on top of the bolt gets installed that if the bolts aren't staked it will cause failure to feed problems. However, Marlin did offer to look it over. You should take him up on the offer.

[CareyH]

The gas key could loose and or not sealed properly. I heard that when a gas key on top of the bolt gets installed that if the bolts aren't staked it will cause failure to feed problems. However, Marlin did offer to look it over. You should take him up on the offer.

Gas key or gas rings on the bolt, A good way to check the gas rings is take the bolt and carrier out of the gun and pull the bolt forward, set it on a table bolt down, and if the bolt rotates closed under the weight of the carrier the rings are bad.

[sniper_tim]

How often do the rings go bad?

Thanks in advance,
Cheers

[DOC]

They don't usually. But the gas key sits on top the bolt carrier and can come loose unless you stake the 2 bolts in place. A factory rifle is done already but if you put one together yourself you may need to do it.

The 3 rings on the bolt hardly go bad unless they are broke. But they should be set at 120 degrees apart from each other to prevent gas leakage. They are just like the rings on a piston so if you oil it you could go the life of the rifle without changing them.

[sniper_tim]

Well, what was the outcome? Is this rifle behaving now, if so, what was the issue? (I have a rifle with almost the exact same symptoms).

Thanks and cheers,
Tim