Hephaestus High Performance CNC Aluminum Piston Head For Krytac Kriss Vector GBB SMG g Comes with a 23 round

Comes with a 23 round gas magazine

Compatibility: Umarex Glock 42 GBB Pistol

HISTORY  The M4 carbine is a family of firearms tracing its lineage back to earlier carbine versions of the M16

Not to mention it includes a tri-lug to 14mm CCW adaptor for easy mounting of suppressors

Folding Rear Sight

Hephaestus High Performance CNC Aluminum Piston Head For Krytac Kriss Vector GBB SMG g Comes with a 23 roundCNC 6061 Aluminum Constructed Piston Head Enhanced Air sealing & Cycling Performance Improve Gas Efficiency and Stability Drop In Replacement Design for the Original Piston Head Compatible With Krytac Kriss Vector GBB SMG Package Included: Hephaestus High Performance Piston Head For Krytac Kriss Vector GBB SMG Piston Head O Ring