Have you ever wanted to mount a red-dot optic on your pistol but didn’t want to send your slide in to be milled? Well, now you can attach a red-dot with a 1913 rail mount to most pistols with a front attachment rail (a 1913 style front rail or similar), such as most Glock models, various Springfield XD models, many Smith & Wesson M&P models, as well as many others with the UM Tactical, UM3 sight mount.