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Posted: 3/10/2017 7:06:32 PM EDT
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Ok guru's help me out on this one. I am a type 7 FFL with a Class 2 SOT..... new to the SOT game
I have made my first post sample and I am having an issue. The gun fires just fine on semi auto but when i flip the switch to full auto I am having a problem. The problem is about the 4th round does not go off. The hammer drops striking the primer but the round dosen't go off. I am thinking a timing issue but if that were the case then this should happen on the second round. Any idea's |
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Quoted:
Which buffer are you using? Good chance your experiencing bolt bounce. +1 in case its a carbine ill just throw the things I do know out there for OP. The Colt 14.5 govt profile barrel requires the H buffer to run burst with full reliability. The Colt 14.5 HB (SOCOM profile) barrel requires the H2 buffer to run FA with full reliability. With both of these barrels, running a lighter buffer than these increases bolt bounce. And I don't know enough about tuning the 20" rifle to comment on that, but also willing to bet its bolt bounce regardless |
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Quoted:
+1 in case its a carbine ill just throw the things I do know out there for OP. The Colt 14.5 govt profile barrel requires the H buffer to run burst with full reliability. The Colt 14.5 HB (SOCOM profile) barrel requires the H2 buffer to run FA with full reliability. With both of these barrels, running a lighter buffer than these increases bolt bounce. And I don't know enough about tuning the 20" rifle to comment on that, but also willing to bet its bolt bounce regardless Other combinations may work but those are what Colt use. |
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Quoted:
20" A2 profile barrels need the H6 buffer and 16" heavy profile barrels need the H3 buffer. Other combinations may work but those are what Colt use. Quoted:
Quoted:
+1 in case its a carbine ill just throw the things I do know out there for OP. The Colt 14.5 govt profile barrel requires the H buffer to run burst with full reliability. The Colt 14.5 HB (SOCOM profile) barrel requires the H2 buffer to run FA with full reliability. With both of these barrels, running a lighter buffer than these increases bolt bounce. And I don't know enough about tuning the 20" rifle to comment on that, but also willing to bet its bolt bounce regardless Other combinations may work but those are what Colt use. Good info brother. I thought I remembered the carbine stock replacement for the A2 and A4 using an H6 buffer. Not sure what one would want to do if they got bolt bounce with an A2 stock and A2 buffer though (I guess maybe they wouldn't get bolt bounce? Not on burst anyway) 
ETA looks like if they did get bolt bounce with the rifle buffer, they could just replace one of the 5 steel weights with a tungsten weight. |
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I've had hit and miss luck going with heavier buffers, but the 2-piece type always cures the bolt carrier bounce problem.
Edited to add: The old DPMS part number is BS-CWB. The new P/N is F620890. I doubt DPMS makes it....I imagine they buy it from someone else. 
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Everyone that owned an M16 that shot mine with the A5 on it . Had one on theirs the next time I would see them.
We even did a little test with 4 shooter's. IDPA target at 30 ft. 1 x 30 rnd mag. Dump mag on target . The A5 always put more hits on target then the stock buffer did. This was probably due to the ROF of the A5. |
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