GP-25
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The GP-25 Kostyor, GP-30 Obuvka and GP-34 are a family of Russian 40 mm under-barrel muzzleloaded grenade launchers for the AK family of assault rifles. The acronym GP stands for Granatomyot Podstvolnyj, "grenade launcher" in Russian, and was... Wikipedia
Barrel length: 120 mm (4.7 in)
Caliber: 40 mm
Designed: 1966–1978
Effective firing range: Sights adjustable 100 to 400 meters
Feed system: Muzzleloader
In service: 1978–present
Manufacturer: Kalashnikov Concern; STC Delta; Arsenal AD; Zastava Arms