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I had an issue on a 1.0 FS M&P 9MM. Well, two problems.

One sounds similar to yours. Small indent on the primer but not firing. Happened 3 or 4 times per magazine. Timing issue on mine. The striker block was not being moved completely up/out of the way by the arm on the trigger bar before the striker was released by the sear. The striker would hit the striker block as it went forward (sometimes) and that would slow the striker down enough to keep it from lighting off the primer.

I think there used to be a video on the Apex web site that explained how to fix that (what to adjust and check).
 

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I did it back in the early 80's with a regular Colt 1911. Stuck that darn pencil in the ceiling above the Chief's desk. Had to get up on the desk to reach that pencil. I don't think he ever noticed the extra hole in that celotex ceiling. Only other guy that saw it was my partner and he didn't tell the Chief.
 
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