Is this gearbox compatible with CRBN Uppers?
AirTac Customs | ALU CRBN Gearbox
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Open Jan 14, 2026 - 12:21 PM
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Answer
Jan 14, 2026 - 12:21 PM
Yes, it allows compatibility of a CRBN Upper with any drop-in HPA (High Pressure Air) engine. CRBN Uppers are lightweight, modular components, and this compatibility is great for those looking to build high-performance, customizable airsoft rifles.
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AirTac Customs | ALU CRBN Gearbox
AirTac Customs | ALU CRBN Gearbox 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...
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