Positively mounts your Hopper! This is one of the most handy accessories for your Rex R1 or Type R. Custom precision machined of durable, lightweight aluminum, it replaces the standard feed neck using the factory screws (not included). The Rex Vertical Clamping Feed Neck features a hex-screw tightening collar that evenly distributes pressure on the whole circumference of the loader neck for a tight, no-slip fit. Your loader will be absolutely secure and tight on your gun! Black anodized finish. Will also fit the Black Dragun, or Dragunfire series (Compact, Bottomline, Sniper, Pi-E1, E2, etc.) marker.