Updated M400 with M-LOK handguard, Sig optics rail, and Bravo Company enhanced furniture. Sig's current-generation mid-tier AR-15. Type: Carbine Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2019, USA Weight: 112 oz Overall length: 32" Status: Active Intended use: Sport Shooting, Home Defense