The MCX Virtus SBR with 11.5-inch barrel in 5.56 NATO. Requires NFA registration as a short-barreled rifle. The folding stock collapses the overall length significantly shorter than any DI AR SBR. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2016, USA Weight: 6.2 oz Overall length: 28.5" Status: Active Intended use: law_enforcement, military, duty