Systema Steel Cylinder Unit M165 for M4/M4A1 PTW

Systema Steel Cylinder Unit M165 for M4/M4A1 PTW SUS304 Stainless Steel Construction Aluminum casing M165 Power Up For the Systema PTW M4 Series Rifle Systema Retains the power level color coding of cylinders via a colorized metal inlay plate on the top of the cylinder.