You even picked out a slide that's already been cut to just accept a Trijicon RMR optic sight, Or even you had an OEM slide Reduce for... Glock + Firearms Glock Firearms Glock 18C Pistol, 9mm Luger, 4.49in barrel Be sure to Permit Your Browser's Cookies Operation Cookies are certainly https://glock18partskit18564.fitnell.com/67190417/the-smart-trick-of-glock-18-upper-that-nobody-is-discussing