Caliber: 9×39 mm SP-5, SP-6
Action: Gas operated, rotating bolt
Overall length: 490 mm (butt folded) or 730 mm (butt extended)
Barrel length: 200 mm
Weight: 2.5 kg empty
Rate of fire: rounds per minute
Magazine capacity: 20 rounds
OTs-12 "Tiss" compact assault rifle (manufacturer's index ОЦ-12 "Тисс", also sometimes spelled as OC-12 in English-language sources) was briefly manufactured during early 1990s by the TSKIB SOO (Central Design Bureau for Sporting and Hunting Arms, located in the city of Tula). It was intended for police use, and was closely based on the AKS-74U compact assault rifle, with main difference being usage of the large caliber, subsonic 9×39 ammunition, which provided significant stopping power and barrier penetration capabilities at short and medium ranges (up to 200-300 meters). Only several hundreds of OTs-12 rifles were made at TSKIB SOO in about 1993, but the mass production, which was anticipated at Tula arms factory, never commenced. Few OTs-12 rifles are still in use by some Law Enforcement units across the Russia.
The OTs-12 "Tiss" compact assault rifle by design is similar to the Kalashnikov AKS-74U rifle, featuring same gas-operated, rotary bolt action, as well as similar controls and furniture, including side-folding skeletonized buttstock. Main differences include new barrel with muzzle brake / compensator, new bolt and a new 20-round magazine for 9×39 ammunition.