GOHIKING Hunting Tactical Scope Rock-Solid 25.4mm-30mm Weaver Picatinny Rings QR Extended Cantilever QD Mounts Bases with Auto Lock Hunting Tactical Scope Rock-solid 25.4mm-30mm Weaver Picatinny Rings QR Extended Cantilever QD Mounts Bases with Auto Lock, features a crowned-rail interface which correctly attach to 20mm rails The uniquely split rings maintain reticle alignment during installation. Features two innovative spring-loaded clamps. The clamps place the majority of the clamping force upon the rail, not the ring. M10 QD-L Scope Mount holds firmly without damaging the scope