Alright guys, Ive done a bit more research, got a few question answered!
I figured ill need a 400-420mm innerbarrel to go in my suppressor.
I have a picture posted below, Ive got a question. The original barrel is 285mm, ive got modify gears, 54t-20t torque 21.6... I have a 15t piston in it (that need to be replaced) Do i need to bore up my cylinder or i can just leave it that way considering my barrel modification?