re: M & P 15-22 Safety Issues

I posted here a while back about my 15-22 having an out of battery discharge. My uncle and I had brought it to the hunting lease with us while doing some scouting. We decided to shoot a few rds while we were there. We didn't have hearing protection because it's 22LR and we didn't plan to shoot too much. He was shooting, while I was standing a few feet away at his 5 o'clock, and had an OOBD during one of his first few shots. The explosion was probably the loudest thing I've ever heard in my life. My ears rang for a few days after that. I'll never not wear hearing protection again regardless of what I'm shooting. Not sure what caused the OOBD, but it could have a lot to do with the ammo I was shooting. We were shooting Rem. Golden Bullets at the time. I later found out from S&W that the 15-22 is really picky about what time of ammo you feed it. Since then I've ran nothing but premium ammo through it and haven't had any issues.