This updated classic takes the M4A1 model to a new level of performance with a one-piece full metal alloy upper receiver

Full/semi auto selector switch in gas blowback housing

1X Buffer Tube

Designed from the ground up as a high-performance mechanical HPA system

Rail Adapter 20mm X 1

MAC Customs Exclusive Full External Setup (Red & Black) inner barrel This updated classic takes theThis setup is a SS Airsoft Exclusive from MAC Customs! Get your one of a kind built external setup now! Available in multiple colors! This package includes: MAC Custom cerakoted Metal Body upper and lower MAC Customs matching carbon fiber Handguard with front sight MAC Custom Carbon Fiber Pom outer barrel with threads and cover for small tracer MAC Custom Cerakoted matching gearbox MAC Custom Receiver End cap Pairs perfectly with the Eurotactics ESG