The Sig Sauer SIGM400 Pro 11.5" SBR delivers a highly refined, duty-ready short-barreled rifle configuration built directly onto a rock-solid AR-15 foundation. Unlike entry-level carbines that feature basic plastic components, this NFA-regulated platform comes standard with premium factory upgrades like an aluminum free-floating M-LOK handguard for rigid accessory mounting. It utilizes a dependable direct-impingement operating system paired with an 11.5-inch carbon steel nitride barrel featuring a versatile 1:7 twist rate. The lower receiver houses an Enhanced SIG Trigger along with full ambidextrous controls, providing optimal ergonomics for both right- and left-handed operators. Complete with factory-installed folding iron sights and a 6-position telescoping polymer stock with integrated QD sling points, this compact defensive tool offers exceptional out-of-the-box handling. Sig Sauer SIGM400 5.56 NATO 11.5" Bbl Pro Semi Folding Sights Aluminum MLOK Handguard Tele Stock Black SBR (NFA) w/(1) 30rd Mag WRM400556N11BPR0SBR