Fully polished "Silver Edge" gearbox increasea overall efficiency by up to 15% from standard gearbox designs

Made from high strength zinc alloy; reinforced in key areas for longevity

8mm stainless steel bearings provide smooth travel for the steel gear set

Ported cylinder optimized for carbine length inner barrels (~363mm)

Integrated "quick spring release" function for easy spring change

Advanced S.D.U. chipset to manage shot-to-shot amperage draw for improved consistency, performance, and instantaneous trigger response making this one of the most efficient stock gearboxes on the market

Wired to the rear with a Deans style T-plug

Ambidextrous cams and gears included

For EMG(by APS) Ver,2 M4 Airsoft AEG Rifles