Got my new M&P 15-rifle 11-9-2012
. I fired approx. 300 rounds of Remington Golden with zero issues -- I know, not recommended ammo. Shame on me!
. Then, (using same box of ammo) frequent issues approx. every 3rd. round: misfires, late fire, difficulty in removing unfired round.
. I cleaned the gun & no improvement.
. Local gun dealer (gunsmith) said breech is probably dirty & that I should clean breech thoroughly & use CCI, 40-grain ammo for good performance.
. No CCI ammo available in my area due to heavy ammo demand
. I cleaned gun again with special emphasis on breech
. Using same ammo, no appreciable improvement.
. Tomorrow, I'm going to try Aguila SNIPER SUB-SONIC 60-GRAIN
Bottom line, why all these problems after ~300 rounds? Same ammo, gun, etc.
