The HK416 D16.5RS is the 16.5-inch carbine variant of the HK416 military lineup, offering a balance between the 14.5-inch standard and the 20-inch long barrel. Produced for civilian sales as the MR556A1 barrel length and used in several military evaluation programs. Provides full rifle velocity from 5.56mm. Type: Assault Rifle Action: Short-Stroke Gas Piston Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2009, Germany Weight: 7.8 oz Overall length: 35.43" Status: Active Military use: Yes Intended use: Military Use, Special Operations