AirTac Customs HPA CRBN Upper tk45 you must register your product

you must register your product on our website product registration page

This is not a flimsy plastic stock

Unique magazine mag well guide that reduce snagging

**Installation required

AirTac Customs HPA CRBN Upper tk45 you must register your productHPA 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