I have a M&P 9FS and I'm having inconsistent primer strikes with some ammo. First off the gun currently has 555rds through it and has the DCAEK and AEK in it. I had a failure to fire around the 400rd mark(very light primer strike)so I pulled the striker out thinking it might be dirty but it wasn't. I got to looking at my empties and all the Federals had good primer strikes, the ZQ1, S&B, and Gold Dot had inconsistent strikes. Some were good and some were light, but enough to ignite the primer. I'm trying to figure out if it's a gun problem or an ammo problem.
I shot the gun stock for the first 100rds, then installed the DCAEK and fired a couple hundred rounds without issue. Then I installed the AEK and had the light strike about 40rds after the install. I've fired a couple hundred rounds since without issues. I though maybe I needed to adjust the trigger bar loop since I had minimal overtravel but after watching the APEX video a second time Randy said that you only need a few thousands of an inch. If anything I probably have a bit more than I need.
I would think that if the trigger bar loop wasn't adjusted right then all the empties would have inconsistent strikes, not just certain brands. Could it be that the S&B, ZQ1, and Gold Dots just have hard primers, and if so what would cause some of the empties to have deep strikes and some to have really shallow? I thought the striker was dragging on the sear since there was a light colored mark on top of the sear and towards the back, but I was told that is normal.
I know the easy thing to would be to only use the Federal, but the gun really likes the S&B and ZQ1, and until I can replenish my stock of 147gr HST's the Gold Dots were going to be my carry ammo(don't know now after seeing the varying primer strikes).
Any ideas on the cause of this?
ETA. before I installed the AEK I had only shot Federal ammo through the gun so I don't know how the gun would've acted with the questionable ammo pre AEK.