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AR Build - 1st shot problem

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Old 05-28-2013, 03:28 AM   #11
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Originally Posted by TekGreg View Post
CGS, I will try new BCG as I have a couple if M-16s that just arrived that will be a good choice. I love the idea of checking the gas block and tube so will try that, too.

Upper receiver didn't have any rub mark or gouge and BCG moved freely with charging handle when brass was extracted. I am going to disassemble, re-inspect, re-lube and test fire. I'll post here as soon as I can get to the range.
It sounds like you had a shell case that caused the problem. Another test fire should answer the questions.

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Old 05-28-2013, 03:36 AM   #12
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I had some really annoying failures when I first built my rifle (there's a sticky on my build and its problems in the AR-15 forum). After testing all sorts of things, it turned out to be the crappy Remington UMC ammo.

I'm not saying this is an ammo problem, but most problems are mags and ammo.

If this is a chamber problem--and that's what it sounds like--you really ought to have a gunsmith check out the headspacing. But you said the brass looked normal when it came out? Not bulging?
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Old 05-29-2013, 05:16 PM   #13
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Just for sh**s and giggles, I would look at the gas key. Seems like the only plausable thing no one else has suggested. Except for gas tube alignment, and a reputable builder should have at least taken care of that.
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