OTs-12 Tiss

OTs-12 Tiss ("Yew Tree") (Russian:ОЦ-12 Тисс) is a Russian fully automatic compact assault rifle. It is chambered for the subsonic 9×39mm round primarily made for police forces.

OTs-12
The OTs-12
Type	Assault rifle Carbine
Place of origin	Russia
Service history
Used by	Internal Troops of Russia
Production history
Designer	V. N. Telesh and U. V. Lebedev
Designed	Early 1990s
Manufacturer	TsKIIB SOO (Central Design Bureau of Sporting and Hunting Weapons)
Produced	1993
No. built	Few hundred
Specifications
Mass	2.5 kg (empty)
Length	730 mm
Barrel length	206.5 mm
Cartridge	9×39mm
Rate of fire	800 rounds/min
Muzzle velocity	270 m/s
Effective firing range	About 200 meters
Maximum firing range	400 meters
Feed system	20-round detachable box magazine (experimental 25-round magazine)
Sights	Iron sights

The rifle was developed in the early 1990s in TsKIB SOO of Tula designers VN Telesh and Yu.V.Lebedev. It is basically an AKS-74U re-chambered for 9×39mm, it was designed as alternative to the AKS-74U. The TsKIB COO of Tula made several hundred of OTs-12s, which were transferred to the Interior Ministry security forces. Despite the good evaluation, the Tula Arms Plant did not establish a mass-production. They instead opted for a bullpup configuration known as OTs-14 Groza which became its successor.

The main design changes from the AKS-74U are in the bolt, barrel, muzzle-brake, and magazine.[1] The 20-round box magazine was designed so that it would be compatible with standard current-issue ammo pouches, but a larger 25-round magazine was in early production until its cancellation.

The subsonic round showed superior penetration of cover at short and medium ranges (200–300 m) when compared to the 5.45×39mm.[2] Still, the OTs-12 did not go into mass-production and was discontinued later that same year.