so i got my gun back together with the airsoftgi aluminum piston, tightbore, and both the trigger sear and piston sear all brand new. all i have to say is this setup on the bar 10 is mean i'm getting crazy groupings and thats with a 30 dollar tightbore, you really can't go wrong on this people. by crazy groupings i mean 2 inches at 100 yards with tsd .28s if you want a cheap tightbore like me get this airsoftgi one its awesome