The M-BRACE Scope Mounting System embodies an evolutionary step taken from ARC's successful M10 Scope Rings that have served thousands of riflemen for over a decade. It is an engineered product standing alone in stark contrast to the conveniently designed gadgets for which engineering was never a consideration. NOTE: When attached to the far aft recoil slot in the picatinny rail on an action with 90 degree bolt rotation, the 32mm height M-BRACE serrated interface block may interfere with the bolt handle when opened. This issue can usually be avoided by moving the mount forward 1 slot in the picatinny rail. Torque spec: 6.2 Nm (55 in-lbs) on scope clamp Mfg: American Rifle Company