Systema Steel Cylinder Unit M150 for M4/M4A1 PTW

Systema Steel Cylinder Unit M150 for M4/M4A1 PTW SUS304 Stainless Steel Construction M150 Power Up The stainless steel cylinders of the latest PTW EVOLUTION contains the same internal parts as the previous version of the PTW, Which means Ccomplete compatibility with existing PTW piston, cylinder head, springs, spring guide and all other parts