light primer strikes

Hello, I built a Polymer80 Glock 26 with all Glock OEM parts including Glock magazines. I have medium/large hands so my pinky finger, sometimes two fingers will go below the magazine and apparently are pushing up. This causes every type of failure because the magazine gets in the way of the...

So here's the story - A couple of weeks ago I was t an outdoor range and trying to sight in one of my MUTT ARs. I was using Magpul 10 and 30 round Gen3 magazines and trying to shot 5 round groups. EVERYTIME I tried, ONLY the first round would fail to fire due to a light primer strike. I would...