NexxSpeed CNC Aluminium Nozzle Valve - Action Army AAP-01/C

Personally wouldn't recommend. broke on the first use

installed it into my nozzle and the small grub screw that's there for adjustment fired out on the first game, if you do buy one i'd recommend scrubbing the loctite off and replacing it with a stronger compound as the screw is going to fire if you have a decent trigger finger or use full auto. i'm pretty lucky the screw didn't chew up my hop, bucking, or inner barrel