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Posted: 4/30/2008 7:40:53 AM EDT
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I have a short barreled 9mm I just finished. I noticed the bolt is hitting the top of the receiver. If the hammer is cocked back the bolt works fine. If the hammer is forward against the firing pin the bolt won't move but about 1/2 inch. It looks like the bolt is wedged against the upper but can't see what is causing it. I haven't tried to shoot it yet because of this problem. RRA barrel RRA upper receiver RRA bolt DPMS lower DPMS lpk RRA hammer RRA buffer & spring RRA mag block KNS non-rotation pins (gen II) |
please forgive me -- I'm just guessing but try removing the RRA mag block and see if the bolt goes back OK. If the bolt moves OK put the mag block back in till it touches the bolt than back it out a hair and tighten the holding screw and try again. |
+1 The mag block might not be installed quite right. |
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I forgot to add I thought the same thing about the mag block. I removed it and it still does the same thing. It feels like the top of the bolt is hitting the upper or the hammer is sticking. It functions fine if the hammer is back. When the hammer is forward the bolt is locked in place and won't move but 1/2" or so. |
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