Retro Arms CNC gearbox V2.2 for HK417 (8mm) – QSC

CNC Upper gearbox part V2 designed for airsoft replicas AR15 (M4), M16 made by manufacturer ICS from Taiwan in EBB (Electronic Blow Back) version. This gearbox is manufactured from one solid block of aircraft aluminum (Dural) EN AW 7075 T651, which has higher strength (590MPa), than common construction steel (390MPa). Because of used material, our gearboxes have the best durability and resilience than common zinc-aluminum gearboxes. We are manufacturing these gearboxes on our precise CNC milling machines in our factory.

Package includes: CNC Upper Gearbox ICS AR15 (EBB), set of screws.

We made some useful improvements into our CNC gearboxes V2:

Spring holders have grooves, so the springs for tapped plate and trigger switch will not jump off.
All threads are now shaped instead of cutted for better strength.
Both of the gearbox parts are centered by milled grooves and edges.
For better durability, we added more material around cylinder head part of the gearbox, this was the most critical part and we added 100% more material where is huge radius.
Outer edges are now cutted off.