CODE – 02-041-982

NAME – HK 54A1

COUNTRY OF ORIGIN – Germany

DATE OF MANUFACTURE – 1982

CALIBER – 9x19mm

OVERALL LENGTH – 41.1 cm (16.19 in) Stock collapsed, 61.6 cm (24.25 in) Stock extended

OVERALL LENGTH WITH SUPPRESSOR MOUNTED – 59.7 cm (23.5 in) Stock collapsed, suppressor mounted, 80 cm (31.5 in) with stock extended, suppressor mounted

BARREL LENGTH – 17.9 cm (7.06 in)

SUPPRESSOR LENGTH – 33.4 cm (13.13 in)

SUPPRESSOR DIAMETER – 4.7 cm (1.85 in)

RIFLING (TYPE & TWIST) – 6-Groove, Right-hand twist, 1 turn in 25 cm (9.84 in)

BULLET DIAMETER – 9.02 mm (0.355 in)

BULLET WEIGHT – 8.04 g (124 grains)

MUZZLE VELOCITY – 396 m/s (1300 fps) Vent ports closed for maximum velocity

MUZZLE VELOCITY – 287 m/s (940 fps) Vent ports open for subsonic velocity

MUZZLE ENERGY – 631 j (465 ft/lb) Vent ports closed for maximum velocity

MUZZLE ENERGY – 330 j (243 ft/lb) Vent ports open for subsonic velocity

WEIGHT (EMPTY) – 2.98 kg (6 lb 9.1 oz)

WEIGHT (LOADED) – 4.28 kg (9 lb 7 oz) loaded with 50 rd drum with M882 Ball

WEIGHT (LOADED) WITH SUPPRESSOR – 4.7 kg (10 lb 5.8 oz) Loaded with 50 rounds M882 Ball, suppressor mounted

SUPPRESSOR WEIGHT – 0.42 kg (14.8 oz)

SUPPRESSOR MOUNTING – Integral with barrel/receiver

SUPPRESSOR OPERATION – Three-stage, expansion chamber, angular baffle stack diffuser, muzzle expansion chamber

SIGHTS – Open iron, adjustable, Front – Ring-protected fixed blade, Rear – Rotating vertical drum with 4 peep apertures of varying size, Adjustable for windage and elevation

EFFECTIVE RANGE – 135 m (150 yards)

OPERATION – Roller-delayed blowback, fires from closed bolt, hammer fired

TYPE OF FIRE – Selective, Semiautomatic/Three-round controlled burst/Full automatic/Locked Breech, Single shot

RATE OF FIRE – 40 rpm Semi, 100 rpm Full

CYCLIC ROF – 800 rpm

FEED DEVICE – 50 round removable spring-loaded drum magazine

FEED DEVICE WEIGHT (EMPTY) – 0.68 kg (1 lb 8 oz)

FEED DEVICE WEIGHT (LOADED) – 1.30 kg (2 lb 13.9 oz) Loaded with 50 rounds M882 Ball

BASIC LOAD – Three 50-rd magazines (150 rounds)

LOAD WT – 3.9 kg (8 lb 9.6 oz)

MANUFACTURER – Heckler & Koch GmbH Oberndorf am Necker, Germany

STATUS – Developmental only

SERVICE – Evaluation, some limited combat evaluation