The JE Machine RMR Plate Cover Plate is a replacement for the plate that comes with MOS versions of the Glock handgun. FeaturesT6 6061 Machined AluminumType II Black AnodizingFor Your Glock Compatible Slides With RMR CutoutCompatible With Glock 17, 22, 19, 23, 34, 35, 26, 27Not Compatible With Glock 43, 43x, 48, 21, 20 DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.