The part is made of steel. It can be used in the CO2 nozzle. Setting can be held relatively consistent (as you can see in the vid). Only thing is: After adjustment, it'll take a few shots before the valve position will stablized (also you can see this in the vid: ~2.43J/2.31/ ----> 0.06J/0.09J/0.01J ---->~0.45J/0.55J/0.39J/)