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