Wikipedia: The GP-25 and GP-34 are a family of Russian 40 mm under-barrel grenade launchers for the AK family of assault rifles. They were first seen by the West in 1984 during the Soviet Invasion of Afghanistan. The GP-30 was lightened and the redesigned sighting system was moved to the right.
The current Izhmash-made version, the GP-34, has an again redesigned sighting system on the right and features the following advantages:
Reliability: It is designed and tested specifically for the Kalashnikov assault rifles, fits such assault rifles directly without any adaptors or forearm dismantling.
Improved safety: The design prevents a round from moving within or falling out of the barrel, even if the muzzle is pointed down. The GP-34 features an additional mechanism (firing pin safety lever) to improve safety during loading.
The grenade launchers are similar in appearance and fire the same 40 mm caliber ammunition and use the same High-Low System developed by Germany in late World War II to keep recoil forces low without a rocket or other type of recoilless weapon back blast.
The GP-30(M) is a stripped-down model grenade launcher, consisting of a very short, 40 mm rifled barrel in front of a basic trigger mechanism with minimal hand grip. On top of the barrel is mounting gear to attach the weapon under the barrel of an AK-series assault rifle, from where it is designed to be fired.
A grenade is first muzzle loaded into the barrel, the weapon is aimed, then the self-cocking trigger is pulled to fire the weapon. This fires the percussion cap at the base of the grenade which triggers the nitrocellulose propellant inside the body of the grenade. The hot expanding gas from the propellant is forced through vents in the base of the grenade that move the grenade along the barrel, and at the same time force the driving band to engage with the twelve rifling grooves. The rifling imparts stabilizing spin to the projectile.
The barrel has a service life of about 400 rounds.
The grenade launchers fire a series of special 40 mm grenades. Originally, the main grenade was the VOG-15 (7P17) fragmentation grenade. This was superseded by the steel-cased VOG-25 fragmentation grenade. The VOG-25 has a lethal radius of six meters. Rounds for the muzzle-loaded GP-25 consist of a single piece containing both propellant and warhead, unlike the more traditional two piece casing-and-projectile design of the comparable American 40x46mm round used in breech-loaded grenade launchers, such as the M203.
A bouncing grenade, the VOG-25P, is also available. On impact, a small charge in the nose of the grenade is detonated; this raises the grenade 0.5 to 1.5 m in the air, before an impact delay fuse detonates it. The VOG-25P also has a lethal radius of six meters.
New generation rounds VOG-M and VOG-PM with an increased effectiveness not less than 1.5 times are now serially available.[3]
Smoke grenades are also available. The original GRD-40 grenade has been replaced by a series of grenades designed for use at different ranges. These are the GRD-50, GRD-100 and GRD-200 for use at 50, 100 and 200 meters respectively. They are capable of producing a 20 cubic meter cloud of smoke that lasts for one minute in winds of up to five meters per second.
A CS gas grenade called the Gvozd ("Nail") and a baton grenade are also available.
Type Grenade launcher
Place of origin Soviet Union
Service history
In service 1978-present
Used by See Users
Wars War in Afghanistan
Soviet-Afghan War
Transnistria war
First Chechen war
Second Chechen War
Russo-Georgian War
Syrian Civil War
Russo-Ukrainian War[1]
Yemeni Civil War (2015-present)
Saudi Arabian-led intervention in Yemen
Saudi-Yemeni border conflict (2015-present)
Production history
Designer TsKIB SOO
Designed 1966-1978
Manufacturer Kalashnikov Concern
STC Delta
Arsenal AD
Zastava Arms
Produced 1978-present
Variants GP-30, GP-30M, GP-34
Specifications
Mass 1.5 kg (3.31 lb) (GP-25)
1.3 kg (2.9 lb) (GP-30)
1.4 kg (3.1 lb) (GP-34)[2]
Length 323 mm (12.7 in) (GP-25)
275 mm (10.8 in) (GP-30)
315 mm (12.4 in) (GP-34)[2]
Barrel length 120 mm (4.7 in)
Cartridge 40mm caseless grenade
Caliber 40 mm
Action Single-shot
Rate of fire 20 rounds/min area suppression[2]
5-6 rounds/min aimed shots[2]
Muzzle velocity 76.5 m/s (251 ft/s)[2]
Effective firing range Sights adjustable 100 to 400 meters[2]
Feed system Muzzle loaded, single-shot
Sights Notched quadrant sight