Replaces the rear sight to allow the mounting of any Trijicon RMR Red Dot Sight. Mounting hardware included. Fit Notes:Sig Sauer Pistols- Fits most Sig Sauer Pistols without adjustable sightsS&W M&P, SD9VE, SD40VE- Does NOT fit M&P SHIELD or C.O.R.E series modelsGlock- Fits all Glock models (not including Glock MOS slides) DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.