Retro Arms Gearbox v2 8mm red grenade the PXG9 features many of

the PXG9 features many of the same features as it's full-metal cousin

1 x Steel Central Compression Spring

DESIGNED TO GIVE THE IMPRESSION THAT YOUR RIFLE SHOOTS QUIETER

Polymer Upper / Lower Receiver

making it available for customization options such as optic sights or tactical lights and grips

Retro Arms Gearbox v2 8mm red grenade the PXG9 features many ofRemade and upgraded CNC gearbox from Retro ARMS with code name "7075 series". 8mm black anodising, 9mm silver anodising. Gearbox version II is completly milled at CNC machining center. Compared to other aluminium gearboxes, our is made out of solib block of aluminium AW EN7075 T651. Source block weighs 1550g and only 143g of material are left. It is not casted like Chinese ones! Our gearbox is tested wit M160 spring without any signs off wear or