My buddy has one. He also bought the short tube and barrel. You mentioned turning it up. Its a typical dude thing to want to do but I assure you, this thing is tuned to perfection out of the box. There is only so much you can get out of a regulated gun this size and Ataman did it. He shoots it all the time and I always shoot it anytime its near me. Super accurate, precision made and very loud. It has a weird trigger like my Leshiy. Its not stiff or gritty, its just vague. Velocity and shot count are very respectable. When it comes off the reg, it degasses and there is almost nothing left. Impressive little gun.