The Smith Wesson MP15 is an AR-style gas-operated semi-automatic rifle designed with military and police as well as personal use in mind. It is chambered in 5.56mm NATO.223 Remington 22 LR and 5.4539mm with an aluminum receiver with hard-coat black anodized finish and either melonite- or chrome-lined barrel. It features a integral trigger guard 6-position telescoping butt stock and adjustable sights. The MP15 is compatible with most standard AR-15 mil-spec components and accessories. DetailsAction Semi Auto - Caliber .22 LR - Capacity 25 - Finish Muddy Girl - Sights Folding MBUS - Overall Length 30.7 - 33.75 - Weight 4.5 lb - Introducing the MP 15-22 SPORT MUDDY GIRL the newest addition to the best-selling MP 15-22 rifle line. The MP 15-22 line was built from the ground up with all of the standard operating features of a modern-version centerfire MP15 rifle. The MP 15-22 SPORT is chambered in .22 LR and features a variety of product enhancements including the 10 MP Slim Handguard with Magpul M-LOK Magpul Folding MBUS sights 6-position telescoping stock and included 2 M-LOK Rail Panel. The new M-LOK enhancements to the popular MP 15-22 rifle allow for a wide range of customization options for a variety of optics and accessories.