CODE – 02-132-970

NAME – Colt Lightweight Rifle/Submachine Gun

NAME (NATIVE) – Colt IMP 221 [Individual Multi-Purpose Weapon]

COMMON NAMES –– GUU-4/P- Gun, Unit, Miscellaneous

COUNTRY OF ORIGIN – USA

DATE OF MANUFACTURE – 1970

CALIBER – 5.7x36mm (.221 Fireball)

OVERALL LENGTH – 43.2 cm (17 in) with flash suppressor

BARREL LENGTH – 25.4 cm (10 in)

RIFLING (TYPE & TWIST) – 1 turn in 30.5 cm (12 in)

BULLET DIAMETER – 5.7 mm (0.224 in)

BULLET WEIGHT – 3.24 g (50 grains)

MUZZLE VELOCITY – 732 m/s (2400 fps)

MUZZLE ENERGY – 867 j (640 ft/lb)

WEIGHT (EMPTY) – 1.66 kg (3 lb 10.6 oz)

WEIGHT (LOADED) – 2.11 kg (4 lb 10.4 oz)

SIGHTS – Open, Iron, Adjustable (Triple set), Front sight – Post, adjustable vertically for elevation when zeroing, Rear sight – Aperture peep, adjustable for windage when zeroing

EFFECTIVE RANGE – 100 meters (109 yards)

OPERATION – Gas operated, fires from closed bolt

TYPE OF FIRE – Selective, Semi and Full automatic

RATE OF FIRE – 40 rpm Semi, 90 rpm Full automatic

CYCLIC ROF – 500 rpm

FEED DEVICE – 10 or 30 round box magazine, double column, double feed

FEED DEVICE WEIGHT (EMPTY) – 0.15 kg (5.3 oz)

FEED DEVICE WEIGHT (LOADED) – 0.45 kg (1 lb)

BASIC AMMUNITION LOAD – Three 30-round magazines (90 rounds)

LOAD WEIGHT – 1.35 kg (3 lb)

MANUFACTURER – Colt Industries Military Arms Division,

STATUS – Technology Demonstrators only

SERVICE – None