CODE – 02-036-941

NAME – Suomi KP M31 (Bunker)

NAME (NATIVE) – ‘bunker sub-machine gun (Korsukonepistooli)

COMMON NAMES – Korsu-Suomi

COUNTRY OF ORIGIN – Finland

DATE OF MANUFACTURE – 1941

CALIBER – 9x19mm

OVERALL LENGTH – 74 cm (29.13 in)

BARREL LENGTH – 31.4 cm (12.4 in)

RIFLING (TYPE & TWIST) – 6 Groove, Right-hand twist

BULLET DIAMETER – 9.02 mm (0.355 in)

BULLET WEIGHT – 8.04 g (124 grains)

MUZZLE VELOCITY – 400 m/s (1312 fps)

MUZZLE ENERGY – 643 j (474 ft/lb)

WEIGHT (EMPTY) – 5.32 kg (11 lb 11.7 oz)

WEIGHT (LOADED) – 5.97 kg (13 lb 2.6 oz) loaded with 36 rounds

SIGHTS – Open, iron, fixed, on the left side of the weapon, Front sight – Blade, Rear sight – V-notch

EFFECTIVE RANGE – 100 meters (109 yards)

OPERATION – Blowback, advanced primer ignition, fires from open bolt

TYPE OF FIRE – Selective, semi and full automatic

RATE OF FIRE – 40 rpm Semi, 120 rpm Full automatic

CYCLIC ROF – 900 rpm

FEED DEVICE – 36 round box magazine, double column, double feed, 50 round box magazine, quadruple column, single feed, 71 round drum

FEED DEVICE WEIGHT (EMPTY) – 36-round mag – 0.23 kg (8.1 oz), 50-round mag – 0.39 kg (13.8 oz), 71-round drum – 1.1 kg (2 lb 6.8 oz)

FEED DEVICE WEIGHT (LOADED) – 36-round mag – 0.65 kg (1 lb 6.6 oz), 50-round mag – 0.98 kg (2 lb 2.6 oz) 71-round drum – 1.94 kg (4 lb 4.4 oz)

BASIC AMMUNITION LOAD – Eight 36-round magazines (288 rounds)

LOAD WEIGHT – 5.20 kg (11 lb 7.4 oz)

MANUFACTURER – Oy Tikkakoski Ab, Jyväskylä, Finland

STATUS – Obsolete

SERVICE – Finnish military