INCLUDES TWO MOUNTING OPTIONS – Comes with a removable standard Picatinny mount and a handgun mount (replaces rear sight) that fits CERTAIN Smith & Wesson models: M&P Full Size, M&P 2.0 Full Size, M&P 22 Full Size, M&P Compact, M&P 2.0 Compact, SD9VE, SD40VE, and M&P Shield. Also works with Zigana PX9. NOT COMPATIBLE WITH CERTAIN MODELS – The included mount does NOT fit Smith & Wesson M&P C.O.R.E. Series (optics ready), M&P Shield EZ .380, M&P .22 Compact, SW9VE, SW40VE, SW40, SW9, Sigma, or 1911 models. Always check rear dovetail spec before purchase.