they gave us suppressed colt 9mm smg in the 1980's for clan lab work. these smg's did not "group" like the un-suppressed smg's that we had/used in the "clet" team. fun to shoot, but did not "group" like the normal smg's. don't know why, just did not "group". we turned them in and went back to the old smg's. both guns were full auto, i love them. easy to shoot.