Samson 30mm Red Dot Quick Release Cantilever Mount Black. QR Red Dot places the center of the red dot 1.53" from the center of the picatinny rail. For use with Aimpoint Comp 3 or Pro-style Red Dots 1913 Picatinny Mil-spec Specifications for Samson 30mm Red Dot Quick Release Cantilever Mount: Manufacturer: Samson Color: Black Red Dot Sights-Footprint: Not Applicable Optic Cut: Not Applicable Package Contents: Samson 30mm Red Dot Quick Release Cantilever Mount Samson QR-REDDOT: 30mm Red Dot Quick Release Cantilever Mount Black