A U-shaped mounting bracket is affixed around a rear iron sight housing. The mounting bracket includes a first and second bracket side that perpendicularly extend from the top bracket side. The first and second bracket sides are secured to the rear iron sight housing of a firearm by a hinge pin driven into the hinge pin holes in the mounting bracket and the rear iron sight housing. Bracket sides extend the top bracket side above the rear sight iron. Fasteners brace the bracket sides securely against the external surface of the rear iron sight housing. The top bracket side can receive a scope rail or the forward mount may have an integrated rail unit. The top bracket side has leveling set to align the attached scope or other sighting device with the axis on the bore of the firearm.
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