Mk239 TP-T

Also known as

Mk239
Mk239 TP-T
30 mm Mk239 TP-T

The Mk239 TP-T is Northrop Grumman's 30 mm target practice tracer round in the 30x173 mm Bushmaster family. The round is a training cartridge derived from the 30 mm PGU-15 TP and matched to 30x173 mm cannon ballistics for Mk44-based weapons.

Mk239 TP-T, 30 mm target practice tracer round, Munitions

Image source: 30x173mm Bushmaster Chain Guns

Profile / Specs

Profile

Origin: United States
Built by: Northrop Grumman
Type: 30 mm target practice tracer round
Service note: Modern Bushmaster training ammunition
Developed from: 30 mm PGU-15 TP

ammunition tracer training cartridge 30 mm cannon

Specifications

NSN: 1305-01-524-0220
DODIC: AA90
Caliber: 30x173 mm
Projectile weight: 372 g
Cartridge weight: 675 g
Muzzle velocity: 3,435 fps (1,047 m/s)
Ballistic match: Mk266 HEI-T and Mk238 HEI-T/SD

Firing Weapons

Northrop Grumman describes Mk239 TP-T as a 30 mm training cartridge for 30x173 mm Bushmaster cannon applications.

Firing weapon

Weapon type

Firing evidence

DS30M 30 mm naval gun, Naval gun, Naval Systems

DS30M 30 mm naval gun

30 mm naval gun mount

Northrop Grumman says Mk239 TP-T was developed for ground vehicle applications that use Mk44 cannons or any cannon firing 30x173mm ammunition, and MSI documents the DS30M family with the Mk44 cannon.

Sources: 30mm X 173mm Suite of Ammunition Product Brochure, MSI-DS SEAHAWK DS A2

Service And Conflict Use

Service History

In service: Training cartridge for Mk44 cannons and other weapons that fire 30x173 mm ammunition.

Media

Mk239 TP-T Images

Mk239 TP-T, 30 mm target practice tracer round, Munitions - view 1 — Source: 30x173mm Bushmaster Chain Guns

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Sources

30x173mm Bushmaster Chain GunsPublisher: Northrop Grumman | Note: Supports the official 30x173mm Bushmaster ammunition family context and the product images used on this page. | Accessed: 2026-06-27 30mm X 173mm Suite of Ammunition Product BrochurePublisher: Northrop Grumman | Note: Supports the Mk239 TP-T designation, 30 mm target practice tracer role, ballistic match data, cartridge dimensions, and PGU-15 TP development context. | Accessed: 2026-06-27 MSI-DS SEAHAWK DS A2Publisher: MSI-Defence Systems | Note: Supports the DS30M Mk 44 cannon context used to connect the Mk239 TP-T round to the naval gun mount. | Accessed: 2026-06-27 1305-01-524-0220, CARTRIDGE,30 MILLIMETER,PRACTICEPublisher: NSN Now | Note: Supports the Mk239 TP-T NSN and DODIC cartridge data. | Accessed: 2026-06-27