The FN 15 M4 Military Collector is FN's civilian reproduction of the current U.S. Army M4A1, with a 16-inch chrome-lined barrel, flat-top upper, and modern furniture built to current military specifications. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2016, USA Weight: 109.6 oz Overall length: 33" Status: Active Intended use: Collecting, Tactical, Duty