Want to start off your next HPA build but don't know how to assemble the gearbox?
Add this tech fee to your cart along with a gearbox, engine, and trigger, and our professional techs will install it for you, ensuring perfect alignment and trigger board contact.
Make sure to include:
- Any Gearbox
- Any HPA Engine
- Any Trigger
- (Optional) Any Selector Plate
Compatibility:
- This gearbox setup will drop into nearly any V2 lower! We highly recommend the G&G lowers and CRBN Uppers