Introducing the Gen 4 HPA CRBN Uppers - a new level of durability!
HPA CRBN Uppers are a sleek way to turn any build into a lightweight beast, made with genuine carbon fiber for strength and durability. Our fourth generation proudly sports new CNC Aluminum Skeletonized Front Threads and Sights as well a durable and 40% stronger Katana HPA Frame.
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!
This AirTac Customs Gen 4 HPA CRBN Upper Includes:
Gen 4 HPA CRBN Upper:
- Lifetime Warranty for breakage / defects
- CNC machined 6061 Aluminum Front Thread
- CNC machined 6061 Aluminum Front Sight
- 40% Stronger Nylon Frame
- Genuine Carbon Fiber tube
- Fiber optic front and rear sights for fast target acquisition
- Dual hopup windows for on-the-fly adjustments
- Perfected drop-in fitment on a G&G lower with a Maxx hopup
- Included Fiber Optics Rods (Green and Red)
- Available in Glossy Black, Matte Black, Red, Blue, Purple, Silver, and Gold tube colors
Compatible with:
- Polarstar Fusion Engine (Drop-In)
- F2, Jack, Inferno, N7, Pulsar etc. (Requires CRBN Gearbox)
- G&G polymer (SSG1, ARP9) and Lancer Tactical lowers (drop in fitment)
- Metal Lower ARP556, Monk Customs and EMG F1 lowers (with modifications)
- MAXX Hopup Chambers (ATPRO, M4P, M4A), Retro Arms, and Lancer Tactical hopup chambers (drop in)
- G&G Stock Hopup, Prowin Hopup (With modifications)
- AirTac Customs CRBN Gearbox