Hello, this is my first post. Lots of great info here!
I recently purchased a M&P15 MOE, great gun. Upon firing it for the first time (after cleaning and oiling the gun)
I was noticing after the first 2-30 round mags I would get an issue with the trigger failing to rese. The Gun cycled fine, just NO rest. upon cycling the charging handle the spent cartridge was inspected (55 grain PMC FMJ) and had what appeared to be a light primer strike.(but i have since learned this indentation in the primer is indicative of the floating firing pin and not a trigger actuated strike)(see pic) At first these failures ocurred about every 3-4 rounds after the first to magazines were fine. Then the gun would not fire ANY rounds chambered by the gas operating action of the gun.
I could MANUALLY chamber a round by pulling the charging handle and releasing and the gun would fire ONCE, But the follow up shot will fail to reset the trigger every time now with the lightly struck primers. I did make sure the gun was cleaned and lubed, pulled the BCG and sprayed down with Ballistol then reinstalled but same result. The manually chambered round fired fine but any following shots chambered by the rifle gas/buffer system resulted in a fail to reset the trigger.
Any Ideas as to what is happening? The gun is stock. I came home today and disassembeled the gun and BCG looking for issues but everything seems OK. Firing pin and trigger group work smoothly with No apparent issues. Once again this was ALL PMC 55 grain on a NEW never previously fired gun and the first 2 30 round mags fired with zero issues. It was the second 2 when the trouble started and finally turned my AR into a manual bolt action rifle! Any and all help and input is appreciated
