The M400 pistol variant features an 11.5-inch barrel, adjustable pistol brace, and M-LOK handguard in Sig's proven M400 platform for a compact SBR-equivalent configuration. Type: Pistol Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2019, USA Weight: 96 oz Overall length: 27.5" Status: Active Intended use: Home Defense, Tactical, Range