The Smith & Wesson M&P15 is a highly versatile AR-15 style semi-automatic rifle, first introduced in 2006, designed for various shooting applications, from tactical use to recreational target shooting. Chambered primarily in 5.56mm NATO and .223 Remington, the M&P15 is also available in .22 LR and 5.45x39mm, offering options for different calibers. Its robust construction includes a 4140 chrome-lined steel barrel with an Armornite finish for corrosion resistance, and it features barrel twists of 1:7, 1:8, or 1:9, depending on the model. Standard features of the M&P15 include a free-float M-LOK handguard, adjustable stock, full-length Picatinny rail, and forward assist for enhanced reliability. Additional features include a chromed firing pin, dust cover, manual safety, and customizable grip inserts. The M&P15 line has expanded over the years, offering configurations such as the M&P15 Sport, a more budget-friendly model with a 16" barrel, and the M&P15 Performance Center, which is built for target shooting with an 18" bull barrel and Picatinny rail system. Compliant models for restricted states feature modifications such as a fixed stock and 10-round magazine. In 2016, the M&P15 Sport II introduced the forward bolt assist and dust cover, improving on earlier Sport models. The latest update, the M&P15 Sport III (2024), comes with a mid-length gas system and free-float handguard, enhancing accuracy and reliability.