Short-barreled military/LE variant of the M400 — restricted transferable. SBR-length select-fire version of SIG's AR-15 platform for government sales. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2017, USA Weight: 112 oz Overall length: 32" Status: Discontinued Military use: Yes Intended use: Service