I have a M&P with factory threaded barrel and installed the APEX duty kit.
I have shot it about 150rounds. Are these guns ammo sensitive?
Most autos I have have not been. I shot some RWS orange and black box the last trip. Off a bench at 10 yds I shot a 2 inch group. Being so close I was expecting a little better. Could be the way I shoot it, I have to get one of my friends to try it. After the M&P I shot my HK45 at the same 10 yds and shot a one inch group.