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Posted: 4/16/2017 11:53:42 PM EDT
[#1]
There are two major possibilities:
Disconnector is worn outside of tolerance and needs to be replaced. You unintentionally bump-fired it. (Not saying you did, but seen it happen, and the person freaked out, especially when they couldn't duplicate the "failure".) |
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Posted: 4/17/2017 12:06:44 AM EDT
[#2]
Hammer follow? Whose FCG?
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Posted: 4/17/2017 12:16:41 AM EDT
[#3]
Quote HistoryQuoted:
Hammer follow? Whose FCG? |
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Posted: 4/17/2017 12:20:47 AM EDT
[#4]
Quote HistoryQuoted:
There are two major possibilities: Disconnector is worn outside of tolerance and needs to be replaced. You unintentionally bump-fired it. (Not saying you did, but seen it happen, and the person freaked out, especially when they couldn't duplicate the "failure".) |
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Posted: 4/17/2017 12:48:39 AM EDT
[#5]
Check disconnect spring. Unless I'm misunderstanding, someone else assembled the lower. Upside down or broken?
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Posted: 4/17/2017 12:49:12 AM EDT
[#6]
Standard hammer? If so you will need to cut the tail off.
On the blowback guns the action is more violent and the hammer tail gets jamed into the disconector preventing it from catching the hammer. If it happens fast enough you get hammer follow bursts. |
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Posted: 4/17/2017 12:02:06 PM EDT
[#7]
Quote HistoryQuoted:
Standard hammer? If so you will need to cut the tail off. On the blowback guns the action is more violent and the hammer tail gets jamed into the disconector preventing it from catching the hammer. If it happens fast enough you get hammer follow bursts. |
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Posted: 4/17/2017 2:36:38 PM EDT
[#8]
Delete
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Posted: 4/17/2017 5:43:41 PM EDT
[#9]
Weak ammo.
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Posted: 4/17/2017 6:45:21 PM EDT
[#10]
Quote HistoryQuoted:
Weak ammo. |
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Posted: 4/17/2017 7:12:10 PM EDT
[#11]
Ask to delete thread, replace all lower components, throw old ones in a lake. Hide dog, not kidding.
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Posted: 4/17/2017 7:33:29 PM EDT
[#12]
Quote HistoryQuoted:
Ask to delete thread, replace all lower components, throw old ones in a lake. Hide dog, not kidding. |
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Posted: 4/17/2017 10:35:11 PM EDT
[#13]
Quote HistoryQuoted:
Pretty much this but destroy parts through in several lakes, you don't want shit like this on internet, I have no faith in ATF. They would fuck you just to make an example of you. Quote HistoryQuoted:
Quoted:
Ask to delete thread, replace all lower components, throw old ones in a lake. Hide dog, not kidding. 
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Posted: 4/18/2017 10:54:35 AM EDT
[#14]
I had a similar issue with a complete PSA Colt lower. Only a few hundred rounds through it and it got worse and worse.
Tossed in a BCM FCG and it hasn't happened since. PSA RMA'd the FCG and sent me a new one. Definitely something funky with the disconnector or maybe there was some tolerance stacking. |
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Posted: 4/18/2017 4:09:41 PM EDT
[#15]
About 2 years ago, I purchased a couple of psa lower parts kits. I noticed that one of them was pretty difficult to get the hammer to catch on the disconnector when doing a function check.
It turned out the channel in the trigger was improperly machined, and wouldn't let the disconnector pivot hardly at all. I replaced mine with an ALG trigger kit and all has been good now. Take a look at the channel in your trigger to make sure its square and deep enough. Mine looked like it was cut with a circular saw blade plunged vertically into it. It was completely circular from front to back. |
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Posted: 4/18/2017 4:28:26 PM EDT
[#16]
With a 9mm? Yes. Switch to a Spikes ST-T2 buffer for a carbine tube. A combo of bolt bounce, slam fire, and bump fire may be occurring.
Make sure your firing pin has a spring on it. A broken hammer pin will cause this, 9mm is tough on those pins. I had an ALG triple and more on me in my 9. They promptly replaced it and it now is 100% If you install a small pin FCG in a large pin lower (not your case) this will also happen with some FCG types. |
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Posted: 4/18/2017 4:29:38 PM EDT
[#17]
Quote HistoryQuoted:
Ask to delete thread, replace all lower components, throw old ones in a lake. Hide dog, not kidding. Bullshit. Just fix your rifle. Don't lend it to a loudmouth friend to take to a public range. |
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Posted: 4/18/2017 7:02:38 PM EDT
[#18]
LOL, I had a carbine build go full auto on me..............NO BIG deal........
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Posted: 4/18/2017 7:41:11 PM EDT
[#19]
I have a PSA AR-9 which uses Glock mags. The entire gun is PSA (complete upper and complete lower all from them). The first range trip it had a few 3 round bursts and a few times it fired out of battery and even blew the magazine out of the magwell. I contacted them here and sent it back to them to take a look at. The repair sheet said it was a faulty FCG and they replaced it. Since I got it back, I have a couple thousand rounds through it with 0 issues.
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Posted: 4/18/2017 7:45:52 PM EDT
[#20]
Quote HistoryQuoted:
Sounds like my cans are never getting out of jail 
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Posted: 4/19/2017 6:25:41 PM EDT
[#21]
Quote HistoryQuoted:
Bullshit. Just fix your rifle. Don't lend it to a loudmouth friend to take to a public range. |
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Posted: 4/19/2017 11:35:04 PM EDT
[#22]
Swapped out the entire FCG with a spare that came out of a Colt 6720. Seems like the place to start, will test this weekend.
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