Alright Glock owners, this NDZ Performance rear slide cover plate is a sweet upgrade from that factory plastic plate! Made from 6061 T6 aircraft-grade billet aluminum that's color anodized for extreme durability, this thing won't chip or break like the stock plastic version. The red anodized finish looks sharp, and it features permanent laser engraving with thousands of design options available from NDZ Performance. Now, important disclaimer - NDZ's color anodized parts are proprietary and won't necessarily match other after-market parts like TiN barrels, pin kits, or triggers. Also, color shades might vary slightly between batches, which is pretty normal with anodized products. The inside pocket profile is CNC machined to the exact factory specifications for a 100% direct fit with no modifications required - it literally just swaps right in. This plate is compatible with Glock Gen 1-4 models including the 17, 19, 20, 21, 22, 23, 24, 26, 27, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, and 41 in calibers including 9MM, .40 S&W, .357 SIG, and .45 GAP. You can match it with other NDZ products like magazine releases, magazine floor plates, and grip plugs for a complete customized look. NDZ Performance manufactures these right here in the USA in their own facility, and they back them with a lifetime warranty against manufacturing defects. Just remember - NDZ has no affiliation with Glock, they just make compatible accessories. If you're tired of the plain factory look and want to add some personal style to your Glock, this quality aluminum backplate is an easy upgrade that makes your firearm uniquely yours while being more durable than the original plastic part.