Posted: 2/16/2016 8:34:11 AM EDT
| M&P made in late 2012/early 2013, round count is probably 2-3k rounds, and the only internal modifications are the Apex DCAEK. Last weekend I went out to do some night shooting at the house and during the session I had roughly 20 (out of 80-90) ftfs. I performed immediate action, and checked the brass out after the fact. Primer strikes looked okay, but weren't really as deep as the fired rounds. I gathered up the duds, reloaded in mags and was able to fire 15 or so on the second try. The rest fired on the third try. Ammo in question is winchester white box. Next night I ran 60 rounds of Tula with no problems. I would like to think that it is ammo related, but is there anything I should look for? I checked the striker channel and didnt see any debris, and the firing pin looks to be okay. |
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Quoted:
Sounds ammo related but: Check the striker for damage You can replace the striker spring Clean the striker channel I agree with all of this. I was having issues but correlated it to my lightened striker spring with CCI primers. My options were: 1. Change spring back to factory specs or 2. Change to a softer primer such as Winchester or Federal. I did both, changed spring and went to WSP primers. . I shoot IDPA and couldn't chance more primer FTF issues. |
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I had a (more than one cause though) failure to fire problem in my M&P 9 FS with the same APEX kit. Not blaming APEX, The pistol had issues before I put the APEX kit in it.
Anyway, one of the failure to fire causes in mine was the trigger bar wasn't getting the striker block up out of the way completely before the sear released the striker. The striker would go forward, sort of hit/bounce through the striker block and hit the primer, leaving an indent, but not hit it hard enough to set it off. It that is your issue, you need to get that trigger bar to "move" to the rear farther before the sear releases the striker. I tried a Glock striker spring first but that didn't work. Not sure what the "official" fix for this is. The APEX striker block is beveled/rounded off around the edges and the trigger bar has to be further to the rear before the striker block is fully raised. |
| one of my M&Ps has this problem with ZQ1 ammo, about 30% of it won't fire but will have a deeper primer strike than ammo that does fire. I checked everything and even installed an extra power striker spring and it will still do it with that ammo so I just quite buying it. My other M&P is set up the same way and it has no problems at all. |