Windham's M4 type carbine with A4 flat-top upper, 16-inch barrel, and mil-spec components. A straightforward duty-quality AR-15. Type: Carbine Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2012, USA Weight: 112 oz Overall length: 32" Status: Active Intended use: Law Enforcement, Sport Shooting, Home Defense