CODE – 01-132-967

NAME -Underwater Defense Gun Mark 1 Mod 0

TYPE – Pepperbox handgun

COUNTRY OF ORIGIN – USA

DATE OF MANUFACTURE – 1967

CALIBER – 12.7x133mm (Mark 59 Underwater Projectile)

OVERALL LENGTH – 24.8 cm (9.75 in)

BARREL LENGTH – None

RIFLING (TYPE & TWIST) – Smoothbore

BULLET DIAMETER – 2.54 mm (0.10 in) x 108 mm (4.25 in), 3.18mm (0.125 in) across fins

BULLET WEIGHT – 9.91 g (153 grains)

MUZZLE VELOCITY – 226 m/s (740 fps) in air

MUZZLE VELOCITY (690 fps) at 18.3 m (60 foot) Depth

MUZZLE ENERGY – 252 j (186 ft/lbs) in air

MUZZLE ENERGY 219 j (162 ft/lb) at 18.3 m (60 foot) depth

WEIGHT (EMPTY) – 1.03 kg (2 lb 4.3 oz) without cylinder

WEIGHT (LOADED) – 1.90 kg (4 lb 3 oz) with 6 rounds and cylinder

SIGHTS – Open, iron, fixed – Front sight – Blade, Rear sight – U-notch, Luminous dots on sights, 1 dot – Front blade, 2 dots – Rear notch

EFFECTIVE RANGE – 9.1 m at 18.3 m depth (30 feet at 60 foot depth)

OPERATION – Manual revolver, double action only

TYPE OF FIRE – Repeating

RATE OF FIRE – 12 rpm

FEED DEVICE – 6 round removable cylinder

FEED DEVICE WEIGHT (EMPTY) – 0.26 kg (9.17 oz)

FEED DEVICE WEIGHT (LOADED) – 0.87 kg (1 lb 14.7 oz) (Mk 59 cartridge – 0.102 kg (3.6 oz) each)

BASIC AMMUNITION LOAD – Two – 6 round cylinders (12 rounds)

LOAD WEIGHT – 1.74 kg (3 lb 13.4 oz)

MANUFACTURER – Advanced Armaments Inc. (AAI), Cockeysville, Maryland

STATUS – Obsolescent

SERVICE – US Navy SEALs and Underwater Demolition Teams.