The HK416 is an assault rifle designed and manufactured by Heckler & Koch. It is a modified version of the American M4 carbine with many changes, most notably a new gas operating system from the Heckler & Koch G36. Customers have the option of purchasing a new upper receiver, buffer and drive spring to refurbish M4s or buying a completely new build HK416.
The HK416 is equipped with a proprietary accessory rail forearm with MIL-STD-1913 rails on all four sides. This allows most current accessories, used on M4/M16-type weapons, to be fitted to the HK416. The HK416 rail forearm can be installed and removed without tools by using the bolt locking lug as the screwdriver. The rail forearm is 'free-floating' and does not contact the barrel, improving accuracy.
The HK416 has an adjustable multi position telescopic butt stock, offering 6 different lengths of pull. The shoulder pad can be either convex or concave and the stock features a storage space for maintenance accessories, spare electrical batteries or other small kit items.
The trigger pull is 34 N (7.6 lbf). The empty weight of a HK416 box magazine is 250 g (8.82 oz).
The HK416's barrel is cold hammer-forged with a 20,000 round service life and features a 6 grooves 178 mm (7 in) right hand twist. The cold hammer-forging process provides a stronger barrel for greater safety in case of an obstructed bore or for extended firing sessions. This includes "OTB" (Over-the-beach) capability; the HK416 can be safely fired after being submerged in water and not completely drained.
Design details
The HK416 uses a proprietary gas system derived from the HK G36, replacing the direct impingement gas system used by the standard M16/M4] The HK system uses a short-stroke piston driving an operating rod to force the bolt carrier to the rear. This design prevents combustion gases from entering the weapon’s interior, a shortcoming with direct impingement systems. The reduction in heat and fouling of the bolt carrier group increases the reliability of the weapon and extends the interval between stoppages. It also reduces operator cleaning time and stress on critical components. The SA80 bull-pup assault rifle used this system long before the HK G36 was developed. According to H&K "experience that Heckler & Koch gained during its highly successful 'midlife improvement programme' for the British Army SA80 assault rifle, have now borne fruit in the HK416.".The HK416 is equipped with a proprietary accessory rail forearm with MIL-STD-1913 rails on all four sides. This allows most current accessories, used on M4/M16-type weapons, to be fitted to the HK416. The HK416 rail forearm can be installed and removed without tools by using the bolt locking lug as the screwdriver. The rail forearm is 'free-floating' and does not contact the barrel, improving accuracy.
The HK416 has an adjustable multi position telescopic butt stock, offering 6 different lengths of pull. The shoulder pad can be either convex or concave and the stock features a storage space for maintenance accessories, spare electrical batteries or other small kit items.
The trigger pull is 34 N (7.6 lbf). The empty weight of a HK416 box magazine is 250 g (8.82 oz).
The HK416's barrel is cold hammer-forged with a 20,000 round service life and features a 6 grooves 178 mm (7 in) right hand twist. The cold hammer-forging process provides a stronger barrel for greater safety in case of an obstructed bore or for extended firing sessions. This includes "OTB" (Over-the-beach) capability; the HK416 can be safely fired after being submerged in water and not completely drained.
| HK416 | |
|---|---|
 Norwegian Army Heckler & Koch HK416N with 419 mm (16.5 in) long barrel, an Aimpoint CompM4 red dot sight and a vertical foregrip. | |
| Type | Assault Rifle |
| Place of origin |  Germany |
| Service history | |
| In service | 2005–present |
| Used by | See Users |
| Wars | Iraq War, War in Afghanistan |
| Production history | |
| Designer | Ernst Mauch |
| Manufacturer | Heckler & Koch |
| Produced | 2005–present |
| Variants | D10RS, D14.5RS, D16.5RS, D20RS, HK416C, MR223, HK417 |
| Specifications | |
| Weight | HK416C: 2.950 kg (6.5 lb) D10RS: 3.020 kg (6.66 lb) D14.5RS: 3.490 kg (7.69 lb) D16.5RS: 3.560 kg (7.85 lb) D20RS: 3.855 kg (8.50 lb) |
| Length | HK416C: 690 mm (27.2 in) stock extended / 560 mm (22 in) stock collapsed D10RS: 797 mm (31.4 in) stock extended / 701 mm (27.6 in) stock collapsed D14.5RS: 900 mm (35.4 in) stock extended / 804 mm (31.7 in) stock collapsed D16.5RS: 951 mm (37.4 in) stock extended / 855 mm (33.7 in) stock collapsed D20RS: 1,037 mm (40.8 in) stock extended / 941 mm (37.0 in) stock collapsed |
| Barrel length | HK416C: 228 mm (9.0 in) D10RS: 264 mm (10.4 in) D14.5RS: 368 mm (14.5 in) D16.5RS: 419 mm (16.5 in) D20RS: 505 mm (19.9 in) |
| Width | 78 mm (3.1 in) |
| Height | HK416C: 236 mm (9.3 in) HK416: 240 mm (9.4 in) |
| | |
| Cartridge | 5.56x45mm NATO |
| Action | Gas-operated, rotating bolt |
| Rate of fire | 700-900 rounds/min (cyclic) |
| Muzzle velocity | Varies by barrel length and type of round used. |
| Feed system | 20, 30-round STANAG magazine or 100-round Beta C-Mag |
| Sights | Rear rotary diopter sight and front post, Picatinny rail |
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