CODE 04-041-961
NAME u2013 HK 21 u2013 7.62x51mm
COUNTRY OF ORIGIN u2013 Germany
DATE OF MANUFACTURE u2013 1961
CALIBER u2013 7.62x51mm
OVERALL LENGTH u2013 82 cm (32.28 in) without buttstock, 102.1 cm (40.2 in) with buttstock
BARREL LENGTH u2013 45 cm (17.72 in) without flash hider
RIFLING (TYPE & TWIST) u2013 4 Grooves, Right-hand twist, 1 turn in 30.5 cm (12 in)
LOAD u2013 M80 Ball Spitzer-pointed full jacketed
BULLET DIAMETER u2013 7.82 mm (0.308 in)
BULLET WEIGHT u2013 9.66 g (149 grains)
MUZZLE VELOCITY u2013 839 m/s (2751 fps)
MUZZLE ENERGY u2013 3395 j (2504 ft/lb)
WEIGHT (EMPTY) u2013 7.32 kg (16 lb 2 oz)
WEIGHT (LOADED) u2013 11.3 kg (24 lb 15 oz) loaded with belt box holding 100-round belt of M80 ball
WEIGHT (MOUNTED) u2013 12.17 kg (26 lb 13 oz) with bipod, sling, support grip, loaded with belt box holding 100-round belt of M80 ball
WEIGHT (MOUNTED) u2013 21.47 kg (47 lb 5 oz) with bipod, sling, support grip, on tripod mount, loaded with belt box holding 100-round belt M80 ball
TYPE OF MOUNT u2013 Removable folding bipod
WEIGHT OF MOUNT u2013 0.60 kg (1 lb 5 oz)
TYPE OF MOUNT u2013 1100 Tripod Mount
WEIGHT OF MOUNT u2013 9.3 kg (20 lb 8 oz)
WEIGHT OF SPARE BARREL u2013 1.7 kg (3 lb 12 oz)
WEIGHT OF SLING u2013 0.17 kg (6 oz)
WEIGHT OF SUPPORT GRIP u2013 0.10 kg (3.5 oz)
SIGHTS u2013 Open, iron, adjustable, Front sight u2013 Hooded post, Rear sight, aperture with rotating elevation drum, 100 meters click stops (109 yard) graduated 100 to 1100 meters (109 to 1,203 yards)
OPTICAL SIGHT u2013 ZF 4×24
OPTICAL SIGHT WEIGHT u2013 0.65 kg (1 lb 7 oz) with mount
OPTICAL SIGHT MAGNIFICATION u2013 4 Power
OPTICAL SIGHT FIELD OF VIEW u2013 5 degrees 40 minutes – 10 m @ 100 m (30 ft @100 yds)
OPTICAL SIGHT ADJUSTMENTS u2013 Adjustable for windage and elevation, 6 adjustments from 100 to 600 m (109 to 656 yards)
EFFECTIVE RANGE u2013 1,200 m (1312 yards)
OPERATION u2013 Delayed blowback, roller locked bolt system, fires from closed bolt
TYPE OF FIRE u2013 Selective, semi and full automatic
RATE OF FIRE u2013 50 rpm semi, up to 200 rpm full automatic with barrel change
CYCLIC ROF u2013 900 rpm
FEED DEVICE u2013 DM-1 steel non-disintegrating link belt, 50 round sections, DM 60/M13 disintegrating link belt
FEED DEVICE WEIGHT (EMPTY) u2013 50-rd DM-1 section u2013 0.18 kg (6.4 oz)
100-round belt box (Empty) u2013 1.08 kg (2 lb 6 oz)
FEED DEVICE WEIGHT (LOADED) u2013 50-rd DM-1 section – 1.45 kg (3 lb 3 oz) loaded with 50 rounds M80 Ball
100-rd DM-1 belt u2013 2.90 kg (6 lb 6 oz) loaded with 100 rounds M80 Ball
100-round belt box (LOADED) 3.98 kg (8 lb 12 oz) loaded with 100 rounds M80 Ball in DM-1 belt
250-rd DM-1 belt u2013 7.25 kg (16 lb) loaded with 250 rounds M80 ball
BASIC AMMUNITION LOAD u2013 Four 250-rd DM-1 belts (1,000 rounds)
LOAD WEIGHT u2013 29 kg (64 lb)
MANUFACTURER u2013 Heckler & Koch GmbH, Oberndorf/Neckar, Germany
STATUS u2013 Production completed, licensed production in other countries
SERVICE u2013 German military, extensive sales international militaries
