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Posted: 8/3/2013 11:04:43 AM EDT
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I'm usually pretty good at solving problems with the AR platform but I'm stumped.
I built my 9mm SBR a few years ago. It uses Spikes upper/lower receivers and uses a spikes BCG. The gun has about 3k rounds thru it. The gun was flawless for along time when about 6 months ago it would fire , chamber the next round but would not fire again with out manually cycling the charging handle. After the first round was fired the trigger felt like it was not reset. So I took it apart to find the problem. Upon removing the Timney trigger I found that it was broken. I sent the trigger back to Timney and they fixed it free of charge. I reinstall the trigger and the gun was good for a awhile. Friday I took it out to shoot and it starts doing the same thing again. It would shoot the first round, chamber the next round but would not fire again with out cycling the charging handle. This morning I removed the Timney. I can't see anything wrong with it. Instead of putting it back in the gun I installed a new Geissele SD3G in it. The gun still is doing the same thing. Upon seeing this I decided to give the BCG a look. I removed the firing pin and cleaned everything. Put it back together with no luck. I am really stumped and need some advice. I did notice the BCG has some wear marks on it where it contacts the hammer. Can a BCG get worn enough to not reset the trigger all the way? I want to say my guns problem is that the hammer is not being reset 100%. Here's a few picture of the wear marks- 
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The hammer on some of the aftermarket triggers is not as tall, especially the Geissele triggers. I had to add material to a ramped bolt to achieve reliablity with the SD3G in my 9mm AR. If the hammer resets only when cycling the bolt while not pulling the trigger and will not catch the disco when you cycle the bolt with the trigger held, bolt profile is likely the problem.
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