AirTac Customs HPA CRBN Upper

HPA CRBN Upper: Lifetime Warranty for breakage / defects CNC milled Carbon Fiber and ABS Polymer 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