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Reinforced shell for high-torque and high-speed builds
improved rigidity
With an adjustable length range of 22mm to 25mm
this complete conversion system allows the use of standard M4 AEG magazines and enhances gas efficiency
Color: Blue (anodized finish)
RetroArms CNC Upper Split Gearbox V2 8mm QSC (2025) Cylinder Heads Reinforced shell for high-torque andThe RetroArms CNC Upper Split Gearbox V2 8mm QSC (2025) is a high performance upper gearbox shell designed for Version 2 AEG split gearbox platforms. Crafted from aircraft grade 7075 T6 aluminum using precision CNC machining, this component offers exceptional strength, tight tolerances, and lightweight construction built to handle high stress, high RPS setups. This upper shell features 8mm bushing bearing compatibility and integrates QSC (Quick Spring
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