FTE on AR-15 upper chambered in 223/5.56

[ghettoblaster]

I'm not sure if the bolt will hold open or not since I've only tried it with other rounds in the magazine.....Always FTE's and then jams when trying to feed the next round into the chamber since the casing didn't eject. I may switch out the upper onto my other lower that I know works well. If anything, I think the short stroke is probably the issue.... I don't quite trust the buffer or spring for some reason. The BCG and chamber are fully lubed.

No gouging on the casing, either. Like I said, I can chamber rounds and eject them just fine. It's only when ejecting spent casings during test fires that I have issues. Leads me to believe the issue lies elsewhere.

BPTactical: where are you located? I may need a second set of eyes on this thing.

Thanks all for your help!

[DFBrews]

I'm not sure if the bolt will hold open or not since I've only tried it with other rounds in the magazine.....Always FTE's and then jams when trying to feed the next round into the chamber since the casing didn't eject. I may switch out the upper onto my other lower that I know works well. If anything, I think the short stroke is probably the issue.... I don't quite trust the buffer or spring for some reason. The BCG and chamber are fully lubed.

No gouging on the casing, either. Like I said, I can chamber rounds and eject them just fine. It's only when ejecting spent casings during test fires that I have issues. Leads me to believe the issue lies elsewhere.

BPTactical: where are you located? I may need a second set of eyes on this thing.

Thanks all for your help!

I would throw another buffer and spring combo in it see if it helps
bert is in Thornton I am in Stapleton if you want someone else to look at it a little closer

[BPTactical]

Unfired rounds are not fireformed to the chamber, that is why they hand cycle ok.
What makes you doubt the buffer/spring?

[ray1970]

Hell. I like to play guessing games. Here's my guess.... Chamber problem.

Either rough inside, cut incorrectly, or maybe a burr or something.

[ghettoblaster]

BPT - I had some trouble with the buffer/spring while I was putting it together. Took me till I disassembled it and put it back together before I felt even mildly comfortable with it.... I'll have to play with that a bit and see. But from the posts on here I think I may have to do a bit more digging on the upper and see if the gas tube is getting enough pressure too.

I'm actually kinda enjoying learning more about this now that it ain't quite working right. However, it would have been nice to have it fully functional last weekend at the range

[ghettoblaster]

Ray - thanks for the suggestion! Would a fired shell casing operate differently than a non-fired shell casing? The unfired ones are cycling great..... perhaps I should bring out the ole magnifying glass and take a closer look, though.

[Lurch]

I would also pull the gas block and check to see if the gas mark is indeed centered on the hole on the gas block. Then you can also check to see if there is anything in the gas port. I will be in Aurora tomorrow I could swing by and take a look.

[BPTactical]

Ray - thanks for the suggestion! Would a fired shell casing operate differently than a non-fired shell casing? The unfired ones are cycling great..... perhaps I should bring out the ole magnifying glass and take a closer look, though.

See post 10 and 13.

RayRay sloooow

[ray1970]

Hey, who moved my Cheetos? I could have sworn they were right here.

[BPTactical]

Hey, who moved my Cheetos? I could have sworn they were right here.

Look in your other hand...........