Answer
Jun 07, 2026 - 06:31 AM
Yes, the crbn upper is compatible with the Polarstar Jack when used with the CRBN Gearbox. The Jack is an HPA engine, and this compatibility ensures wide support for popular HPA systems.
Is this compatible with the Polarstar Jack? AirTac Customs | GEN 5 HPA CRBN Upper
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Open Jun 07, 2026 - 06:31 AM
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AirTac Customs | GEN 5 HPA CRBN Upper
AirTac Customs - GEN 5 HPA CRBN Upper The HPA CRBN Uppers feature dual hopup windows, fiber-optic front and rear sights, perfect fitment, and CNC aluminum parts. All for the same price! All uppers are cross-compatible, so you can swap your tubes and parts between any of your CRBN uppers! ...
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