The original HK416 D145RS is the Delta Force-developed piston AR-15 that spawned the HK416 product line, featuring a 14.5-inch barrel and corrosion-resistant finish. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2005, Germany Weight: 88 oz Overall length: 35" Status: Active Military use: Yes Intended use: Military, Law Enforcement