CODE – 01-041-968

NAME – HK4

COUNTRY OF ORIGIN – Germany

DATE OF MANUFACTURE – 1968

CALIBER(S) – 5.7×15.6mmR – (.22 Long Rifle HV)

6.35×15.5mmSR – (.25 ACP)

7.65x17mmSR – (.32 ACP)

9x17mm – (.380 ACP)

OVERALL LENGTH – 15.7 cm (6.18 in)

BARREL LENGTH – 8.5 cm (3.35 in)

RIFLING (TYPE & TWIST) – 6 Grooves, Right hand twist, 1 turn in 20 cm (7.87 in)

BULLET DIAMETER –

5.7×15.6mmR – (.22 Long Rifle HV) – 5.7 mm (0.223 in)

6.35×15.5mmSR – (.25 ACP) – 6.38 mm (0.251 in)

7.65x17mmSR – (.32 ACP) – 7.92 mm (0.312 in)

9x17mm – (.380 ACP) – 9.04 mm (0.356 in)

BULLET WEIGHT –

5.7×15.6mmR – (.22 Long Rifle HV) – 2.59 g (40 grains)

6.35×15.5mmSR – (.25 ACP) – 3.24 g (50 grains)

7.65x17mmSR – (.32 ACP) – 4.80 g (74 grains)

9x17mm – (.380 ACP) – 6.16 g (95 grains)

MUZZLE VELOCITY –

5.7×15.6R – (.22 Long Rifle HV) – 290 m/s (951 fps)

6.35×15.5mmSR – (.25 ACP) – 250 m/s (820 fps)

7.65x17mmSR – (.32 ACP) – 250 m/s (820 fps)

9x17mm – (.380 ACP) –240 m/s (787 fps)

MUZZLE ENERGY –

5.7×15.6mmR – (.22 Long Rifle HV) – 109 j (80 ft/lb)

6.35×15.5mmSR – (.25 ACP) – 101 j (75 ft/lb)

7.65x17mmSR – (.32 ACP) – 150 j (111 ft/lb)

9x17mm – (.380 ACP) – 177 j (131 ft/lb)

WEIGHT (EMPTY) – 0.480 kg (1 lb 1 oz)

WEIGHT (LOADED) –

5.7×15.6mmR – (.22 Long Rifle HV) – 0.547 kg (1 lb 3.3 oz) loaded with 8 rounds Ball

6.35×15.5mmSR – (.25 ACP) – 0.560 kg (1 lb 3.8 oz) loaded with 8 rounds Ball

7.65x17mmSR – (.32 ACP) – 0.583 kg (1 lb 4.6 oz) loaded with 8 rounds Ball

9x17mm – (.380 ACP) – 0.588 kg (1 lb 4.7 oz) loaded with 7 rounds Ball

SIGHTS – Open, iron, adjustable for zero, Front sight – Square blade, Rear sight – Square notch on dovetail base

EFFECTIVE RANGE – 25 m (27 yards)

OPERATION – Blowback, double-action

TYPE OF FIRE – Semiautomatic

RATE OF FIRE – 24 rpm

9x17mm (.380 ACP) – 21 rpm

FEED DEVICE – 9x17mm – (.380 ACP) – 7 round removable box magazine, single column, single feed

5.7×15.6mmR – (.22 Long Rifle HV), 6.35×15.5mmSR – (.25 ACP), and 7.65x17mmSR – (.32 ACP) – 8 round removable box magazine, single column, single feed

FEED DEVICE WEIGHT (EMPTY) – 0.040 kg

+0.010 kg for finger rest added to magazine

FEED DEVICE WEIGHT (LOADED) –

5.7×15.6mmR – (.22 Long Rifle HV) – 0.067 kg (2.4 oz) loaded with 8 rounds Ball

6.35×15.5mmSR – (.25 ACP) – 0.080 kg (2.8 oz) loaded with 8 round Ball

7.65x17mmSR – (.32 ACP) – 0.103 kg (3.6 oz) loaded with 8 rounds Ball

9x17mm – (.380 ACP) – 0.108 kg (3.8 oz) loaded with 7 round Ball

BASIC AMMUNITION LOAD –

5.7×15.6mmR – (.22 Long Rifle HV) – Two – 8 round magazines (16 rounds)

6.35×15.5mmSR – (.25 ACP) – Two – 8 round magazines (16 rounds)

7.65x17mmSR – (.32 ACP) – Two – 8 round magazines (16 rounds)

9x17mm – (.380 ACP) – Two – 7-round magazines (14 rounds)

LOAD WEIGHT –

5.7×15.6mmR – (.22 Long Rifle HV) – 0.134 kg (4.7 oz)

6.35×15.5mmSR – (.25 ACP) – 0.160 kg (5.6 oz)

7.65x17mmSR – (.32 ACP) – 0.206 kg (7.3 oz)

9x17mm – (.380 ACP) – 0.216 kg (7.6 oz)

MANUFACTURER – Heckler & Koch GmbH, Oberndorf/Neckar, Germany

STATUS – Production completed

SERVICE – Law enforcement, commercial sales