The AD-SM Magnifier Swing Off Mount HR ( Hinge Ring for non-straight barreled magnifiers )features an absolute co-witness when used on an AR15, M16, M4 flat top with Mil-Spec size iron sights. It enables the operator to flip the magnifier out of view for an unmagnified sight picture. It is configurable for a right or left direction of flip. Fits Magnifiers with a 30mm tube. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock™ Lever system in either standard or TAC design to accommodate both in spec and out of spec rail systems.