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Posted: 10/22/2010 12:06:36 PM EDT
My M16 came in yesterday finally  . Got it out the the range and had a few slight kinks with the .22 kit but got it working in no time.When i put on my 7.62x25 DI upper, a few of the rounds and almost always on the last round, the trigger just hurts. Never had the problem in semi and have shot a bunch of M16's and haven't experienced this before. The setup was a 7.62x25 DI upper 12", 9mm buffer, regular springs, same polish ammo i have been shooting in semi without a problem.  |
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Welcome to the world of trigger slap. Your hammer is cycling too vigorously, slapping into the disconnector, and transferring that mechanical energy, painfully, to your trigger finger.
You can add a heavier buffer, restrict your gas, or buffer/relieve the hammer back and disconnector to prevent slap or at least reduce it. At a guess, I'd say you're shooting some of the high-pressure hot subgun surplus tokarev ammo? |
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Quoted: I thought polish was on the lower end of the surplus ammo.Welcome to the world of trigger slap. Your hammer is cycling too vigorously, slapping into the disconnector, and transferring that mechanical energy, painfully, to your trigger finger. You can add a heavier buffer, restrict your gas, or buffer/relieve the hammer back and disconnector to prevent slap or at least reduce it. At a guess, I'd say you're shooting some of the high-pressure hot subgun surplus tokarev ammo? My plan was to turn the uppe into a piston upper at some point. I always though the gas ports were way too far back on these and way over gassing the system. I have already broken a bunch of BCG parts while shooting semi. I have some buffers i think are heavier. I'll try them out and if they not heavy enough my gunsmith made one for himself out of solid bronze, supposed to weight a ton but works great on his blow back tok. |
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If you are getting enough trigger slap to cause discomfort I suggest you stop right now. Better yet, stop yesterday. Consider the impact loading to your alloy receiver as transmitted through your steel FCG pins. Even if my registered part was a RDIAS or RLL I would not just party on. Egging the FCG holes of a RR - and having to have it repaired - is definitely not what you want........unless this is a postie and you're doing some kind of test to destruction.
Stop. Figure out the cause. Resume cautiously. And no, using KNS pins does not mean you can continue rapping your fingers. If I was breaking BCG parts at even a tick past an expected frequency I'd be addressing that, too. I have broken exactly one (1) extractor on a BCG with well past 15k rounds. That's it. Sam |
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The parts i broke so far are. 2 lugs ripped off the bolt 2 cam pins several extractor pins ejector spring These were in my semi SBR, not the RR. The gun im using right now is a transferable, which is why i don't want to keep shooting this upper on it. I have a postie coming next month but still don't want to do it to that one either. I'll head over to my smith this week and move the gas port further up. |
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Quoted:
The parts i broke so far are. 2 lugs ripped off the bolt 2 cam pins several extractor pins ejector spring These were in my semi SBR, not the RR. The gun im using right now is a transferable, which is why i don't want to keep shooting this upper on it. I have a postie coming next month but still don't want to do it to that one either. I'll head over to my smith this week and move the gas port further up. Clearly hardcore! Why don't you get him to tap a setscrew into your gas block while you are at it. As I have posted here many a time I make my own regulated gas blocks and they work wonders. 
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