This CRBN Gearbox enables you to use a CRBN Upper with ANY V2 airsoft replica engine system! It's now possible to use Polarstar drop-in engines such as the F2, F1, and Jack in your build, as well as the Gate Pulsar!
We changed the game with our colorful CRBN uppers, but now it's time to customize the rest of the gun. Welcome to AirTac Customs' next generation of aluminum rifle parts!
Want to add a little spice to your ESG build? We now have the very first aluminum endcaps in stock! No more SLS, no more 3D printing. All our endcaps are now made with 6061 aluminum and anodized in 6 colors!
We changed the game with our colorful CRBN uppers, but now it's time to customize the rest of the gun. Welcome to AirTac Customs' next generation of aluminum rifle parts!
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