APS - "Silver Edge" 8mm Ver.2 Airsoft AEG Gearbox Shell Marker Case Works great with GBB and

Works great with GBB and propane adapters

Hop-Up / Style: Yes Adjustable

Material: Silicone Oil

Package Includes: x1 Prometheus Hard Piston

APS - "Silver Edge" 8mm Ver.2 Airsoft AEG Gearbox Shell Marker Case Works great with GBB andFeatures: Fully polished "Silver Edge" gearbox increases 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 Integrated "quick spring release" function for easy spring change Compatibility: For APS ambidextrous M4 platforms (May work with other brand TM spec M4 AEG rifles, but will require