Civilian semi-auto version of the HK416A5 sold under the MR556A1 designation. Piston-driven AR-compatible lower with H&K proprietary upper, offering HK416 reliability in a US-legal configuration. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2010, Germany Weight: 8.6 oz Overall length: 35.43" Status: Active Intended use: Tactical, Recreational, Competition