OTs-12 assault rifle

OTs-12 Tiss ("Yew Tree") (Russian:ОЦ-12 Тисс) is a Russian fully automatic assault rifle chambered for the sub-sonic 9 x 39 mm round.

Work on the weapon started in the early 1990s. Basically a rechambering and reworking of the more conventional AKS-74U assault carbine, it differs only in the bolt, barrel, muzzle-brake, and magazine. The 20-round box magazine was designed so it could be compatible with standard current-issue ammo pouches but a larger 25-round magazine was rumored.

In 1993 a few hundred were built and delivered to the Russian Internal Troops for evaluation. They performed excellently, with the subsonic round showing superior penetration of cover at short and medium ranges (200–300 m) when compared to the 5.45x39mm. Still, the OC-12 didn't go into mass-production and was discontinued later that year.

Other Designations

 * OC-12