Well I just got back from shooting my brand new m&p 15-22. serial # DTX****It shot everything i fed it without a hitch. I fired slow ,medium, and very fast , no problems, i loaded the mags carefully and without care no difference. It was rather cold and snowy so i really did not try for any real accurate shooting. But it really shot a farly decent group off hand. I fired a total of about 250 rounds. Mostly federal auto match 40grain solids,some cci mini mags 36 grain hollow points and some windchester 36 grain 333 pack hollow points.I must say whenever everything is working right it sure is a joy to shoot.pghrich