This guide details the installation and use of the DI Optical 3x Magnifier (3XP78A) with its A.R.M.S. #78 QD mount. It covers unboxing, mounting on a Picatinny rail, testing the flip-to-side T.I.T.S. mechanism, and considerations for eye relief and compatibility. The review highlights the magnifier's excellent glass clarity and its utility for targets at 100-300 yards, despite adding weight. Installation is straightforward, with clearance for iron sights and charging handles confirmed.
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