How a HK416 Rifle Works

Wikipedia:The Heckler & Koch HK416 is a gas-operated assault rifle chambered for the 5.56×45mm NATO cartridge. It is designed and manufactured by the German company Heckler & Koch. Although the design is based on the AR-15 class of firearm (specifically the Colt M4 carbine family issued to the U.S. military), it uses a proprietary short-stroke, gas piston system from Heckler & Koch's earlier G36 family of rifles. The HK416 is the standard assault rifle of the Norwegian Armed Forces, and it has been selected by the French Armed Forces to replace the FAMAS. Other users of the HK416 include the German Army and the Irish Army Ranger Wing, as well as the US Navy's SEAL Team Six, who used it to kill Osama Bin Laden in 2011. Type Assault rifle Carbine (HK416C) Squad automatic weapon (M27 IAR) Place of origin Germany Service history In service 2004–present Used by See Users Wars War in Afghanistan (2001-2021) Iraq War War in Iraq (2013-2017) Operation Inherent Resolve German intervention against ISIL Opération Chammal Turkish-Kurdish conflict Militias-Comando Vermelho conflict Production history Manufacturer Heckler & Koch Produced 2004–present Variants See Variants Specifications Mass 3.120–3.850 kg (6.88–8.49 lb) (A5 without magazine) 3.740–4.470 kg (8.25–9.85 lb) (A5 with full 30-round magazine) Length 709–1,030 mm (27.9–40.6 in) (A5, retractable stock) Barrel length HK416C: 9 in (230 mm) HK416D: 10.5–20 in (270–510 mm) HK416F: 11–14.5 in (280–370 mm) M27 IAR: 16.5 in (420 mm) Width 78 mm (3.1 in) Height 236–240 mm (9.3–9.4 in) Cartridge 5.56×45mm NATO Action Gas-operated short-stroke piston, rotating bolt Rate of fire 700–900 rounds/min 850 rounds/min (HK416 A5) Muzzle velocity 730 m/s (9 in) 788 m/s (10.4 in) 882 m/s (14.5 in) 890 m/s (16.5 in) 917 m/s (20 in) Effective firing range A5 11″: 300 metres (330 yd) A5 14.5″: 500 metres (550 yd) A5 16.5″: 600 metres (660 yd) A5 20″: 800 metres (870 yd) Feed system 10-, 20-, 30-round detachable STANAG magazine, 100-round detachable Beta C-Mag Sights Picatinny rail–mounted front and rear iron sights, optional removable gas block-mounted flip-up front sight post