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** THIS PRODUCT MAY REQUIRE SOME FILING. ONCE ALTERED, IT CANNOT BE RETURNED ** Dueck Defense, Inc. Red Dot Back Up Sight Base Made for Smith & Wesson M&P Handguns. For use with Leupold 1 & 2, Doctor Red Dot Sight, JP Enterprises J Point and Burris Fast Fire 1, 2 & 3, Vortex Viper & Vortex Venom. “I designed the RBU as a simple no gunsmithing sight base to eliminate lost dots when aiming. Just align the fixed iron sights and your red dot is visible. It’s simple and it works.” Please note that S&W dovetails vary slightly from gun to gun. Our sights are manufactured to fit snug but may require some filing in order to fit some of the tighter dovetails. Light Filing may be necessary for proper fit and installation. Whereas a small triangle file will work a 60 degree dovetail file is best. We are not responsible/liable for damage/destructions to the RBU/sights or slides during installation.