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Posted: 3/23/2017 6:47:26 PM EDT
| Did first AR Pistol build and went to the range and had problems with duds ( primer dimpled but no fire) probably 8 times out of 70 rounds also the bolt never locked back after the mag was empty. Any help would be appreciated. Here is the config: Radical Firearms 7.5" 5.56 1/7" Twist Upper w/ Round Rail , Primary Arms CQB muzzle compensator ( in place of Birdcage it came with Muzzle, SAA - AR-15/M16 Nickel Boron M16 Style ENHANCED M16 Style Bolt Carrier Group, Raptor Charging handle, KAK Super Sig SB15 Buffer Tube kit, KAK Lower parts kit, and a Ruger roll mark lower. When it did fire it had very little recoil. Thanks in advance |
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 Is it under gassed?
If your gas block is not adjustable, are the ports in the barrel and gas block lined up properly?  If adjustable, give it more gas. Sounds like the bolt carrier may be not going back far enough to lock back on mag and also not returning hard enough to fully seat allowing the firing pin to barely reach the round.  Could explain the perceived low recoil as well. |
| Due to the fact that the rounds are shooting out at 1'clock I believe it may be over gassed. And maybe getting a little bounce and not fully seated. The last round stuck in the chamber and had to be rodded to get out. Its a factory complete upper from Radical firearms non adjustable. |
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Quoted:
Turns out I had the hammer spring upside down. Will test at range tomorrow. Thanks all.  Make sure your extractor spring has enough tension and has an o-ring on it for extra tension. I replaced my original spring and bumper (had no o-ring) with a BCM extra power kit which has a higher tension spring, bumper and o-ring. Might help your extractor slipping over the case head problem. |
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