Before you had to either buy a new gun or pay a gunsmith if you wanted a red dot on your pistol. Meprolight’s engineering team solved this dilemma with the quick-detach (QD) adapter that utilizes the existing rear dovetail slot for sights to mount the adaptor to hold the Mepro microRDS or any other red dot optic on the market. It is the only mounting solution to have quick mount and dismount without having to re-zero the pistol. Now almost every pistol can use a red dot optic without the need to drill and tap mounting holes on barrels or slides. The adaptor mounts directly to a Meprolight TruDot, self-illuminated sight which also functions as a back-up sight should the shooter want to remove the red dot optic. It can be placed back on the gun without having to re-zero the sight. Features and Specifications: Interface: Dovetail (Backup Sight) Backup Sight Illumination: Tritium Backup Sight operation Time: 10 Years Support Plate Matte Black Supported Sights: Meprolight MicroRDS, Trijicon RMR, EOTech MRDS, Leopold Delta, Docter, CMORE, Vortex, Burris Fits:Sig Sauer P-Frame Model Pistols