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Posted: 7/27/2004 6:19:25 PM EDT
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Mellow greetings fellow ARFers. My AR15 is a Rock River lower with Armalite internals, barrel is 11 1/2 inch with 5.5 inch AK74 brake from Bushie in a DPMS A2 upper, and it's failing to cock. When I fire, the bolt carrier comes to the rear and the expended case is ejected. The next round in the magazine feeds properly, but will not fire. The hammer is apparently following the bolt carrier forward. The rifle is less than a year old and worked properly for about 50 rounds, then worked properly intermittently, now fails every time. Examination of the rifle showed the hammer pin had moved out of one side of the lower, allowing the hammer to tilt out of vertical. Moving it back into place apparently restored proper operation - haven't been back to the range, yet. How do I avoid this problem again, or , what holds the pin in place to prevent lateral movement? Thanks! |
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Also, when checking for engagement, if the J spring falls out, then you will need to dimple the spring threw the small view holes in the hammer. All that is needed is to just peen the spring surface at the hole with a 1/16" punch. Don't go buck wild, slightly peen the spring leg to so that the flared out section of the spring leg will not move downward past the small hole. The reason that I bring this up is that you may have to pull the J spring to re-bend it to retain the hammer pin if the center groove in the hammer pin is correct. If you do, make sure to bend the spring to apply pressure into the hammer pin channel. This will apply more pressure to the J spring to retain the hammer pin. Or, you could just chuck the pin up in a drill and deepen the center groove if the hammer J pin is applying pressure if the hammer pin still slips past/work it's self out with the correct amount of tension form the J spring. |
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