Things You'll Need
Instructions
Remove the screw plugs located on top of the rifles upper receiver with a small flat-head screwdriver.
Place the Weaver-style mount into position and secure it using the screws that came with the mount.
Loosen the retention screws at the base of the weaver scope rings--on the Trijicon ACOG--and widen the ring's retention bracket.
Place the scope on the mount with the retention screws inserted into the slots that are cut across the mount. Align the brackets over the sides of the mount and tighten the retention screws, thereby securing the scope.