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The GP-25 "Kostyor" (English: Bonfire) is an underslung grenade launcher designed in the Soviet Union by KBP Instrument Design Bureau in 1978. It was an upgraded version of the BG-15, which was initially designed to fit the AK-47. It has been made compatible to fit with many Kalashnikov-style rifles.
It uses a 40mm caseless grenade and can be shot at an effective range of 400 meters at a muzzle velocity of around 76.5 meters per second. A new modern version of the GP-25 is the GP-30, which is attached to more modern Kalashnikov firearms such as the AK-101.
"The predecessor to the GP-30, The GP-25 is a muzzle loaded underbarrel grenade launcher. Intended for lobbing grenades long distances it is effective against infantry and soft targets but does minimal damage to armored vehicles."
— In-game description
The GP-25 is a weapon featured in Battlefield 2 and is attached to the AK-47, issued uniquely to the PLAAssault kit. It replaces the standard hand grenades available with the PLA Medic's AK-47.