ARES ONE-PIECE CYLINDER E.F.C.S. GEARBOX FOR M4 FRONT WIRE (AR-GBE08)

UPGRADED E.F.C.S. GEARBOX
REINFORCED METAL CONSTRUCTION
ONE-PIECE SEALED CYLINDER
REINFORCED FULL TEETH PISTON
HIGH QUALITY SPRING
DELAYER
FRONT WIRED
WEIGHT 492g