One-Piece Cylinder Set for Gearbox V2

put a 170 spring in and got less fps than my stock spring which is much lighter, then i put in this chamber and new piston head on mod piston, went from325 to 470 fps with .36g rnds, got one 500.9 with .26g bb. so far awesome part', only kinda fits in my ics dmr,, bit of a squeeze, the action to access the hopup sticks open with my gun, but the functionality of this chamber is very good

Great quality zero air escape not much to say except that it is my favorite cylinder and cylinder I have. (I am a tech and have 30+ guns). Picky with some aluminum nozzles but I recommend a vfc polymer nozzle. After 10,000 shots, still sealed perfectly with the AOLS piston and piston head as well. Very satisfied!

Was ok none of the clynder heads I have made a perfect seal

Good!