The Really Right Stuff SOAR HC Pro system is based on both the Nato Picatinny Standard and the RRS 1.5" Dovetail Standard. A screw knob style clamp designed to directly mount onto the swivel version of the Harris bipods. You will now be able to mount anywhere along your rifles standard picatinny rail, RRS SOAR custom chassis mount, multi-purpose rail, or full length chassis RRS/Arca rail. Features: Machined 6061 T6 Aluminum Construction Direct mount to Harris Bipod Swivel models Satin tumbled black finish Really Right Stuff HC-Pro Picatinny/RRS Dovetail Clamp for Harris Bipod HC-Pro