Building a custom Glock 21? This is a factory-new, aftermarket slide from Spectre Supply, chambered in .45 ACP for the Glock 21 and Glock 21 SF models (Gen 1, 2, and 3). It's made from SUS416 stainless steel and has a durable black Melonite QPQ finish for a tough, matte look. Features include front and rear serrations for easy racking, a bullnose profile at the front, and it's bead-blasted for that non-reflective finish. It's also designed to fit P80 frames and other Glock clones, giving you build flexibility. This is just the slide – you'll need to add your own barrel, recoil spring, and internal parts kit. Perfect for a custom build, a replacement for a damaged slide, or just to give your G21 a fresh, aggressive look. Unlocks the potential for optics cuts, custom porting, or other modifications you might want to do. For builders and enthusiasts who want to personalize their .45 ACP powerhouse. Check compatibility with your specific frame before purchasing!