CODE – 04-132-966

NAME – Machine Gun Mark 21 Mod 0

COUNTRY OF ORIGIN – USA

DATE OF MANUFACTURE – 1966

CALIBER – 7.62x51mm (7.62 NATO)

OVERALL LENGTH – 118.7 cm (46.75 in)

BARREL LENGTH – 61 cm (24 in)

RIFLING (TYPE & TWIST) – 4 Grooves, Right-hand twist, 1 turn in 30.5 cm (12 in)

LOAD – M80 Ball, Spitzer-pointed full jacketed ball

BULLET DIAMETER – 7.82 mm (0.308 in)

BULLET WEIGHT – 9.66 g (149 grains)

MUZZLE VELOCITY – 877 m/s (2877 fps)

MUZZLE ENERGY – 3713 j (2739 ft/lb)

WEIGHT (EMPTY) – 16.33 kg (36 lb)

WEIGHT (LOADED) – 25.43 kg (56 lb) loaded with 250 rounds M80 ball in M13 link belt with M19A1 ammunition can

WEIGHT (MOUNTED) – 118.43 kg (261 lb) on M26 Gun Mount loaded with 250 rounds M80 ball in M13 link belt with M19A1 ammunition can

TYPE OF MOUNT – Mk 26 Pintle-type Gun Mount

WEIGHT OF MOUNT – 93 kg (205 lb)

SIGHTS – Open, iron, adjustable, Front sight – Folding blade, Rear sight – Ladder-type with aperture, adjustable from (0 to 2,400 yards in 200 yard increments)

EFFECTIVE RANGE – 1,100 m (1,200 yards)

OPERATION – Recoil with gas booster, fires from closed bolt

TYPE OF FIRE – Full automatic

RATE OF FIRE – 150 rpm

CYCLIC ROF – 600 to 650 rpm

FEED DEVICE – M13 disintegrating metallic link belt

FEED DEVICE WEIGHT (EMPTY) – 1.07 kg (2 lb 6 oz) 250 – M13 links

M19A1 Ammunition Box (EMPTY) – 1.68 kg (3 lb 11 oz)

FEED DEVICE WEIGHT (LOADED) – 7.42 kg (16 lb 6 lb) 250 rds M80 ball in M13 link belt

M19A1 Ammunition Box (LOADED) – 9.1 kg (20 lb 1 oz) with 250 rounds M80 ball in M13 links

BASIC AMMUNITION LOAD – Six M19A1 ammunition cans with 250 round M80 ball belts (1,500 rounds)

LOAD WEIGHT – 54.6 kg (120 lb 6 oz)

MANUFACTURER – Naval Ordnance Station, Louisville, Louisville, Kentucky

STATUS – Obsolescent

SERVICE – US Navy