Alpha Parts M90 Cylinder Set for Systema Over 14.5" Inner Barrel PTW M4

Alpha Parts M90 Cylinder Set for Systema Over 14.5" Inner Barrel PTW M4 SUS304 Stainless Steel Construction M90 Power Cylinder For the Systema Over 14.5 Inch Inner Barrel PTW M4 Series 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