We offer AR-15 complete uppers in a variety of calibers - 223/5.56, 300 Blackout, 7.62x39, 6.8 SPC II, 6.5 Grendel, 458 Socom, 224 Valkyrie. We also have AR-15 uppers in pistol calibers like 9mm, 40 S&W and 45 ACP. All our AR-15 complete uppers are carefully assembled and inspected for quality assurance. All of our parts are sourced from the most reputable manufacturers in the industry.