Explore Sig Sauer .223 Remington firearms built around the M400, PM400, SIG516, SIGM400, MCX Virtus, and MCX Rattler platforms. This catalog tag brings together semi-auto rifles, tactical pistols, collapsible-stock patrol models, and compact folding designs chambered in .223 Rem, 5.56 NATO, or .223/5.56. From the M400 Elite and TREAD M400 to the PM400 Elite pistols and MCX Rattler, these firearms focus on controlled handling, AR-style ergonomics, and dependable range performance. The selection also includes the Sauer 100 XT bolt-action rifle for hunters and shooters looking for a .223 Rem option with a more traditional precision rifle format.