NAME – 40x46mm Mk 299 Mod 0 300-Meter Warning Signal

NAME (COMMON) – MK 299 300 m Warning

CALIBER – 40x46mmSR

TYPE – Sound and Flash at specific range

YEAR OF INTRODUCTION –

COUNTRY OF ORIGIN – USA

IDENTIFYING COLOR CODE – Silver cartridge case with black ink markings, green plastic projectile with three raised rings

CASE TYPE – Semi-rimmed straight

CARTRIDGE LENGTH – 10.5 cm (4.13 in)

CASING LENGTH – 4.59 cm (1.81 in)

CASE HEAD DIAMETER – 41.05 mm (1.616 in)

CASE RIM DIAMETER – 43.50 mm (1.713 in)

PROJECTILE TYPE – Non-fragmenting flash-bang

PROJECTILE DIAMETER – 41.24 mm (1.624 in) at rotating band

FILLER – Pyrotechnic flash charge

FILLER WEIGHT – 3.5 g (0.12 oz)

FUZE TYPE – Black powder delay, initiated on firing

FUZE DELAY – 3.8 seconds

CASING WEIGHT – 0.095 kg (3.35 oz)

MAXIMUM RANGE – 6.1 m (20 feet) altitude fired at 12⁰ elevation at 300 m

EFFECT – 5 million candlepower flash, 170 decible bang, at point of detonation

MANUFACTURER – Defense Technology, Casper, Wyoming

STATUS – Production

SERVICE – US Navy