An essential part reimagined by AirTac Customs - the ALU CRBN Gearbox is a lightweight gearbox for M4 rifle builds, now in CNC Aluminum.
Our CRBN Gearbox enables you to use a CRBN Upper with ANY M4 HPA engine system! It's now possible to use drop-in engines such as the P* F2, Jack, Gate Pulsar, and Inferno in CRBN builds! Sporting an innovative 3 piece design and available in 10 classic colors.
This AirTac Customs ALU CRBN Gearbox includes:
AirTac Customs ALU CRBN Gearbox:
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Skeletonized Lightweight Design
- Removable trigger door for easy trigger tuning and swaps
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10 Brand New anodized Colors!
- CNC 6061 Aluminum construction
- Left/Right alignment screws for full alignment control
- Up/Down alignment screws for maximum clamping force
- Allows compatibility of a CRBN Upper with any drop-in HPA engine
- Does not include selector plate
Compatible with:
- [CRBN] G&G-style V2 Lowers (SSG1, ARP9, SSG556, etc)
- Any other V2 lower, upper, and grip.
- Any standard M4 HPA engine