Rear Slide Back Plate Engraved for GLOCK Flat Dark Earth FDE T6 Aluminum with Magpul FDE Finish Customize from a plastic factory part to a quality engraved metal. Fits Generation 1-4: 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 30, 31, 32, 34, 35, 37, 38, 39 Proudly Made in the USA.