-  Version A works with:  GEN1, 2, 3, 4, 5, 6 T68 Flex-air Adapter  ( version A ) , and  T68 Pistol line Markers.
    For 5oz / 3000 bottle butt stock guide pin. ( more info )

-   Note: Not compatible for use with 88g disposable cylinder.  ( more info )

Butt Stock Pin Version A

Version B uses a push button release for quick change of CO2 bottle without using any tool.

-  Version B works with:  All RAP4, Xpower, T68 GEN7, X7 Internal Flex-air Adapter, X7 Phenom Air Adapter. 

-   Note: Not compatible for use with 88g disposable cylinder.  ( more info )