AirTac Customs Gearbox

The ALU CRBN Gearbox is designed to be compatible with standard V2 M4 HPA engines. It is engineered to bridge the gap between various upper receivers and these drop-in engines, providing a stable housing for most common systems.

The three-piece design allows you to access internal components more easily than a standard one-piece shell. The standout feature is the removable trigger door, which lets you perform quick adjustments or swaps without needing to fully disassemble the entire gearbox.

Precision alignment screws for both horizontal and vertical axes allow you to fine-tune your nozzle positioning. This is critical for ensuring consistent air seal and feeding, which directly impacts your rifle's accuracy and shot-to-shot consistency.

No, this gearbox is specifically designed for HPA drop-in engines. It is not intended for use with traditional AEG gear sets, pistons, or motors.

Not at all. The gearbox is machined from 6061 aluminum, which is chosen specifically for its high strength-to-weight ratio. It provides a durable, rigid structure that is lightweight enough to keep your overall build agile.