The HK416 D20RS features a 20-inch heavy barrel intended for designated marksman and sustained-fire roles. It provides maximum velocity from 5.56x45mm at the cost of additional weight and length. Used by units requiring extended engagement ranges beyond standard carbine capability. Type: Assault Rifle Action: Short-Stroke Gas Piston Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2004, Germany Weight: 8.58 oz Overall length: 38.58" Status: Active Military use: Yes Intended use: Military Use, Designated Marksman