This Co2 magazine based cap is made of metal. The patented design of 2 rotations (Inner silver / outer bronze) allow better air sealing and pierce of the Co2 caninster more easily.

*** Fail to screw the magazine end cap properly may result in low FPS, weak blow back cycle and no slide lock when magazine is empty

Please read instruction manual or view our instruction video carefully on how to screw the magazine end cap properly.