I have an M-TAC that when I switch from semi to 3 shot or automatic, it chops paint on the very first trigger pull (after the one shot safety). This happens everytime I switch it to 3 shot or auto modes. While using it in semi, however, I have never chopped paint.
I even upgraded to the 4C eyes. Any ideas what could be wrong?
My rotor fed m-tac also chopped paint on full auto-burst, but was fine on semi. Same symptoms with my TM-15. I changed out the batteries on the rotor and it was the fix for both guns. If you are using a rotor, you might not notice it slowing down unless you open it up and listen to it run with the old batteries, and then do the same with some new batteries. Also, I just had my m-tac upgraded to the supercharged engine. its not even broken in yet, but its even more quiet and has even less kick than before. I shot it with the new engine at a scenario game and fired about 4500 rounds in 2 days and it performed great!
Also noticed with the PE that it was tearing up my detents pretty fast. With the SC engine, the detent looked brand new even after the all weekend game.