Technological advances in design and manufacturing made it possible for full-size red dot rifle optics to be reduced in size to fit pistols. However, there were three options- buy a new gun, have a gunsmith mill your slide or go without-if the gun was not optics ready. Meprolight's engineering team solved this dilemma with the patented quick-detach (QD) adaptor Kit 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 Mfg: Meprolight