The OTs-14 "Groza" (ОЦ-14 “Гроза”) is a Russian bullpup assault rifle designed in early 1990s and manufacture started in 1994 by TsKIB SOO. Designed after the AKS-74U, it was intended for Spetsnaz use. Three common variants exist; one is chambered in subsonic 9×39mm cartridge, and there are ones chambered in 7.62×39mm (accepts AK magazines) and 5.45×39mm. The pistol grip and trigger assembly can be replaced with an alternate trigger module with an integral GP-25 grenade launcher. The short barrel accepts either a suppressor or an extension with an integral foregrip.