MAXX Model CNC Aluminum Hopup Chamber M4A - PRO (for standard M4 AEG) Receiver Kit offering the perfect balance between

offering the perfect balance between strength

excellent wear resistance

Manufactured by RetroArms – Czech Republic

3 platforms and compatible clones

Highly polished inner surface to reduce friction and ensure smooth piston operation

MAXX Model CNC Aluminum Hopup Chamber M4A - PRO (for standard M4 AEG) Receiver Kit offering the perfect balance betweenThe MAXX Model CNC Aluminum Hopup Chamber M4A PRO is a premium hop up unit designed for standard M4 M16 AEG rifles with rear or front wiring gearbox. Engineered with high precision CNC machined aluminum, this hop up chamber ensures superior BB feeding, consistent air seal, and precise hop adjustment for stable FPS and accuracy. The M4A PRO model features an advanced adjustment system with a removable brass slider and locking mechanism, providing