Infantry Weapons

GP-25 Kostyor

The GP-25 Kostyor is a Soviet 40 mm muzzle-loaded under-barrel grenade launcher developed by TsKIB SOO and produced by TOZ. It mounts beneath Kalashnikov-pattern rifles, fires 40 mm VOG-25 caseless grenades, and remains the baseline GP-series launcher that later versions such as the GP-30 followed.

GP-25 Kostyor, 40 mm under-barrel grenade launcher, Infantry Weapons

Image source: GP-25 at Tula State Museum of Weapons.jpg

Profile

Origin: Soviet Union
Built by: TOZ
Type: 40 mm under-barrel grenade launcher
Service note: Adopted in 1978; still in service
Designer: TsKIB SOO / V. N. Telesh
Designed: 1972-1978
Produced: 1978-present
Developed into: GP-30

portable grenade launcher small arms

Specifications

Caliber: 40 mm VOG-25
Operation: Double-action, single-shot
Feed system: Muzzle-loaded
Barrel length: 120 mm
Weight: 1.5 kg empty; 1.76 kg loaded
Length: 323 mm
Muzzle velocity: 76 m/s
Range: Point blank up to 400 m

Service And Conflict Use

Service History

In service: Adopted by the Soviet Army in 1978 and still used on AK-pattern rifles.
Used by: Soviet Army

Compatible Rifles

The GP-25 is a 40 mm under-barrel launcher designed to fit beneath Kalashnikov-pattern rifles.

Compatible item

Item type

Compatibility evidence

Assault rifle

The Commons file shows a GP-25 fitted to an AK-74M, and reference sources describe the GP-25 as a launcher designed for Kalashnikov-pattern rifles.

Sources: AK-74M with GP-25.jpg, SAS GP-25 weapons ID sheet

GP-25 Kostyor Videos

ГП-25 Костер – Советский Подствольный Гранатомет для Гранат ВОГ-25 калибра 40 мм. Приклад для ГП

GP-25 Kostyor Images

GP-25 Kostyor, 40 mm under-barrel grenade launcher, Infantry Weapons - view 1 — Source: GP-25 at Tula State Museum of Weapons.jpg

GP-25 Kostyor, 40 mm under-barrel grenade launcher, Infantry Weapons - view 2 — Source: AK-74M with GP-25.jpg

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Sources

GP-25 and GP-30Publisher: Modern Firearms | Note: Supports GP-25 development history, AKM/AK-74 compatibility, ammunition family context, and baseline technical characteristics. | Accessed: 2026-06-23 GP-25 KostyorPublisher: Weaponsystems.net | Note: Supports GP-25 origin, designer, producer TOZ, and technical characteristics including caliber, length, weight, operation, and range. | Accessed: 2026-06-23 SAS GP-25 weapons ID sheetPublisher: Small Arms Survey | Note: Supports GP-25 identification, technical data, and the fact that the launcher fits beneath Kalashnikov-pattern assault rifles. | Accessed: 2026-06-23 GP-25 at Tula State Museum of Weapons.jpgPublisher: Wikimedia Commons | Note: Primary image provenance for the standalone GP-25 image on Wikimedia Commons. | Accessed: 2026-06-23 AK-74M with GP-25.jpgPublisher: Wikimedia Commons | Note: Gallery image provenance and visual evidence for a GP-25 fitted to an AK-74M. | Accessed: 2026-06-23