Mk 12 Gas Block .750 (commercial) Left - Aluminum handle with Lew’s

- Aluminum handle with Lew’s Performance handle knob

functions and unique design elements included in this compact and rugged powerhouse

- Handguard: Aluminum

- Fits standard holsters

side focus

Mk 12 Gas Block .750 (commercial) Left - Aluminum handle with Lew’sThe MK12 Gas Block is only compatible with the RIS II (M4A1 & MK18) family of rail systems manufactured by Daniel Defense. It is not compatible with any other Daniel Defense rail system. This is due to various clearance issues. This only applies to rail system lengths that would completely shroud the gas block. If you are mounting the gas block to the barrel without being shrouded by the rail system, then this does not apply. In that case, it will fit