Guide 01 / Installation
HPA Gearbox Installation
Installing a BullCraft drop-in kit or reinstalling the gearbox after receiver service? Start here.
- Use this when
- Completing the initial kit installation or reinstalling the complete gearbox assembly.
- Pay attention to
- Trigger and selector placement during receiver reassembly.
- Applies to
- BullCraft VFC/Elite Force MP7 HPA drop-in kits.