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Ships within 48 hours · Estimated delivery Nov 10 - Nov 15
Complete HPA engine kit with dual solenoid closed-bolt system
Disclaimer⚠️ This ETU is for airsoft use only and is not intended for real firearms
Compatible with most V2 gearboxes including M4
Mancraft CNC M4 Lower Receiver Stock Plug
Ideal for high-performance AEG builds using the Quick Spring Change system
RetroArms CNC Gearbox V2 (8mm) – QSC Best Seller Complete HPA engine kit withThe RetroArms CNC Gearbox V2 (8mm) QSC is a high precision, CNC machined aluminum gearbox shell built for AEG M4, M16, and similar Version 2 platforms. Engineered for maximum strength and performance, it features Quick Spring Change (QSC) functionality, allowing rapid tuning without full disassembly. Made in the Czech Republic, this gearbox delivers exceptional rigidity, smooth gear alignment, and long term reliability perfect for high torque, high
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