OTs-14 Groza

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Ots-14 Groza drawing
Type Bullpup assault rifle
Place of origin Russia
Service history
In service 1994–present
Used by Russia[citation needed]
Wars See Conflicts
Production history
Designer V.N. Telesh
Y.V. Lebedev
Designed 1990s
Manufacturer TsKIB SOO
Produced 1994
Variants OTs-14-4A
Weight 2,7 kg
(OTs-14-4A-01 and OTs-14-4A-02)
3,6 kg
(OTs-14-4A and OTs-14-4A-03)
Length 610 mm (OTs-14-4A)
565 mm (OTs-14-4A-01)
500 mm (OTs-14-4A-02)
720 mm (OTs-14-4A-03)
Barrel length 240 mm (Groza-4)
415 mm (Groza-1)
Width 60 mm (OTs-14-4A without a grenade launcher)
75 mm (OTs-14-4A with a grenade launcher mounted)
70 mm (OTs-14-1A without a grenade launcher)
80 mm (OTs-14-1A with a grenade launcher mounted)
Height 294 mm (OTs-14-4A without a grenade launcher)
266 mm (OTs-14-4A with a grenade launcher mounted)
350 mm (OTs-14-1A without a grenade launcher)
320 mm (OTs-14-1A with a grenade launcher mounted)

Cartridge 9×39mm (Groza-4)
7.62×39mm (Groza-1)
Action Gas-operated, rotating bolt
Rate of fire 700 rounds/min (Groza-4)
750 rounds/min (Groza-1)
Muzzle velocity 300 m/s (Groza-4)
720 m/s (Groza-1)
Effective firing range 200 m (Groza-4)
300 m (Groza-1)
Maximum firing range 400 m (Groza-4)
500 m (Groza-1)
Feed system 20-round detachable box magazine (Groza-4)
30-round detachable box magazine (Groza-1)
Sights Iron sights, several optical and night vision sights

The OTs-14 Groza (ОЦ-14 "Гроза") is a Russian selective fire bullpup assault rifle chambered for the 7.62×39 round and the 9×39mm subsonic round. It was developed in the 1990s at the TsKIB SOO (Central Design and Research Bureau of Sporting and Hunting Arms) in Tula, Russia. The weapon is colloquially known as OC-14 or OTs-14 "Groza" ("Thunderstorm"). The OTs-14-4A "Groza-4" has one derivative, the TKB-0239 (ТКБ-0239), also known as OTs-14-1A "Groza-1", chambered for the 7.62×39mm round.


Work on the OTs-14-4A project began in December 1992. The weapon's chief designers were Valery Telesh, responsible for the GP-25 and GP-30 under-barrel grenade launchers, and Yuri Lebedev. The team set out to design an integrated system that would incorporate all the best features of a close combat arm into a single weapon using the AKS-74U as a starting platform. Prototypes were ready for testing in less than a year and the weapon was ready for production by early 1994.

It was first presented to the public at the MILIPOL Moscow trade show in April 1994 and adopted by the Ministry of Internal Affairs (MVD) shortly thereafter. The success of the OTs-14-4A in the hands of MVD personnel brought it to the attention of the Ministry of Defence (MO), who also had a requirement for such a weapon. After a period of testing, the weapon was adopted for spetsnaz forces and some airborne and specialist front-line combat units such as combat engineers. The weapon was originally intended to have used any one of four cartridges: 5.45×39mm, 5.56×45mm NATO, 7.62×39mm or 9×39mm. That idea was dropped and the assault rifle was originally chambered in 9×39mm to meet the MVD's requirement for a close combat weapon for deployment in Chechnya.

Design details[edit]

Internally OTs-14 "Groza" is an exact copy of AKS-74U but in a bullpup configuration and chambered for 9x39 SP-6 subsonic ammunition. The trigger / pistol grip unit could be removed and replaced with an alternative unit integral with 40 mm grenade launcher. In that configuration a single trigger controls with a separate barrel selector both the 40 mm grenade launcher and the rifle itself. The safety/firing mode selector of AKS-74U pattern is retained. The barrel itself can be fitted with a specially designed quick-detachable silencer. OTs-14 carrying handle has provisions for mounting a long-range optical sights, tactical collimator sights or night vision optical sights. As it was meant to replaced the AKS-74U in the battalions of Spetsnaz MVD as a standard service firearm there are also variants chambered for 7.62x39mm. The idea behind this design was to have an easily modified basic version which would be used in different combat scenarios as a carbine, assault rifle with a foregrip, silenced assault rifle with detachable silencer and assault rifle with an integrated under-barrel grenade launcher.

Operating mechanism[edit]

The OTs-14-4A is a small arms weapon system based on the 5.45×39mm AKS-74U carbine. It is a selective fire, air-cooled magazine-fed rifle with a gas-actuated piston operating system and a rotary bolt locking mechanism.


The OTs-14-4A shares 75% of its components with the AKS-74U.[citation needed] The basic components of the weapon are borrowed directly from the AKS-74U assault rifle and slightly modified, simplifying the design as a whole and making the weapon considerably cheaper. The weapon has modular design allowing for assembly of one of four weapon versions depending on the assigned mission. It is configured in a bullpup layout for increased portability and balance. The grip is displaced forward, making the assault rifle compact, suitable for concealed carrying and so well balanced that it can be fired using just one hand, like a pistol.

The weapon fires from a closed bolt and has a hammer-type firing mechanism. It has a unitary trigger; a three-position combination fire mode selector switch / manual safety on the left side of the receiver sets whether it fires either the rifle or the grenade launcher or places it in "safe". The assault rifle is equipped with iron sights contained in the carrying handle that consist of an adjustable rear aperture sight on a tangent leaf with range graduations from 50 to 200 m, and a forward post. The grenade launcher is aimed using a folding leaf sight. The weapon will also accept several optical sights, including the PSO telescopic sights which mount directly onto the carrying handle or, as on early models, onto a bracket on the left side of the receiver housing. The OTs-14-4A also has a night sight dovetail that will accept all standard night vision optics.


It is issued in an aluminum transport case with equipment and accessories for a wide array of tactical situations.(IMAGE) Included in the case are two different grip and trigger assemblies, one for use with the modified GP-25/30 grenade launcher and another for use when the launcher is detached. When the grenade launcher is installed, the combined rifle and grenade launcher is operated with a single trigger. A selector switch on left side of the grip near the trigger guard allows the user to select between rifle or grenade barrels. When the grenade launcher is detached, it is replaced by a vertical grip. A suppressor is also included in the standard kit, as is a quick-change short barrel for use with the suppressor or for when maximum compactness is desired.


  • OTs-14-1A Groza-1 - Primary model chambered in 7.62×39mm M43 Soviet; it uses the same magazines as the AK-47 / AKM assault rifles. Originally an experimental chambering, it was later adopted by the Army in 1998 for use by its Airborne, Combat Engineering, and Spetsnaz troops. It has more hitting power and range than the subsonic version and can use cheaper ammunition readily available from supplies.
    • OTs-14-1A-01 - Carbine Variant with a short barrel and a vertical foregrip.
    • OTs-14-1A-02 - Special Carbine Variant with a short barrel threaded for a suppressor.
    • OTs-14-1A-03 - Special Sniper Variant with a short barrel threaded for a suppressor and a telescopic sight bracket on the carrying handle / iron sights.
    • OTs-14-1A-04 7,62/40 - Grenade Launcher variant with a long barrel and a GP-30 under-barrel grenade launcher. Note: As of 2014 this variant also seems to be in service in limited numbers with the Naval Infantry.[a]
  • OTs-14-2A - Experimental model chambered in 5.45×39mm M74 Soviet. Not adopted due redundancy caused by preference for the better ballistic performance of the 7.62×39mm round when fired through a short barrel.
  • OTs-14-3A - Experimental model chambered in 5.56×45mm NATO. Neither adopted nor put into production due to a lack of interest from the domestic military or the firm's foreign customers.
  • OTs-14-4A Groza-4 - Primary model chambered in 9×39mm Subsonic; it uses the same 20-round magazines as the AS Val ("Shaft") assault rifle and VSS Vintorez ("Thread-cutter") sniper rifle. It was adopted in 1994 by the Ministry of the Interior's OMON Special Operations troops.
    • OTs-14-4A-01 - Carbine Variant with a short barrel and a vertical foregrip.
    • OTs-14-4A-02 - Special Carbine Variant with a short barrel threaded for a suppressor.
    • OTs-14-4A-03 - Special Sniper Variant with a short barrel threaded for a suppressor and a telescopic sight bracket on the carrying handle / iron sights.
    • OTs-14-4A-04 9/40 - Grenade Launcher variant with a long barrel and a GP-30 under-barrel grenade launcher.


  • Weapon compactness, relatively small weight and bullpup layout provide a good balance and reduced barrel jump.
  • It is as reliable as the Kalashnikov assault rifle, as it is based on the same internal design.
  • 9×39mm SP-5 and SP-6 subsonic rounds along with an attachable suppressor provide very silent shooting, while retaining effectiveness in the engement of targets behind weak to mild cover or targets wearing bulletproof vests of class three (Type II) protection.
  • Heavy 16 grams (250 gr) 9 mm (.356 in) bullet provides high stopping power and lethality in comparison to other pistol calibre cartridges.
  • Good accuracy and a decent rate of fire maximises the number of hits achieved in a single opportunity on a target, dramatically increasing lethality.
  • Modular design allows the weapon to be converted into an assault rifle, a CQB assault rifle, a grenade launcher, and a sniper rifle.


  • Short sight radius make aiming problematic. Curved trajectory of the 9×39mm round makes it difficult to choose the aiming point.
  • Bullpup frame causes difficulties with changing of the magazine.
  • The 9×39mm Subsonic variant has a low capacity 20-round magazine and due to the performance capabilities of its bullet it is ineffective against targets behind moderate to heavy cover or targets wearing bulletproof vests providing protection greater than that of class three (Type II). The 9×39mm round detracts from the weapon's lethality as it is prone to mame rather than kill insufficiently armoured targets in combat conditions, especially at ranges in excess of 200m, due to undesirable shot placement and low muzzle energy.
  • Use of a single trigger for both assault rifle and grenade launcher slows down switching from grenade launcher to assault rifle and back.
  • The side-mounts for different optics must be set up additionally.
  • Variants without grenade launcher have a shifted gravity center.
  • Left-handed shooting is impossible, because of an extractor situated close to the face on the right side of the weapon.
  • The 7.62×39mm variant suffers from excessive muzzle flash and a loud report due to the shortened barrel.


The OTs-14 Groza has been used in the following conflicts:

See also[edit]


  1. ^ They may refer to it by its alternate TKB-0239 designation.