Ukrainian Gyurza-M boats Berdyansk and Nikopol were intercepted, fired on, captured, and later returned after the 2018 Kerch Strait incident. During the full-scale invasion, sources documented captured Ukrainian hulls, Lubny sunk and later raised, Nikopol damaged by a Lancet, Ukrainian air-defense and river-flotilla use, and captured Akkerman and Vyshhorod reportedly incorporated into Russian service after rearmament.
Role detailsNaval Systems
Gyurza-M class gunboat / Project 58155
Also known as
- Gyurza-M
- Gurza-M
- Gyurza-M class
- Gurza-M class
- Small armored boat Gurza-M
- Gyurza-M class artillery boat
- Project 58155
- Project 58155 Gyurza-M
- Project 58155 Gurza-M
- MBAK
- MBAK Gyurza-M
- Project 58155 MBAK
- MBAK-08 Bucha
- P174 Akkerman
- P175 Berdyansk
- P176 Nikopol
- P177 Kremenchuk
- P178 Lubny
- P179 Vyshhorod
- P180 Kostopil
- P181 Bucha
- UAT Gyurza
- Viper class
The Gyurza-M class / Project 58155 is a Ukrainian small armored gunboat series built by Kuznya na Rybalskomu for river, harbor, lake, and littoral patrol. Eight boats were completed for the Ukrainian Navy from the first 2012 keels through Bucha's 2023 commissioning, with wartime records spanning Kerch Strait capture, 2022 naval losses, Lancet damage, and later river-flotilla air-defense patrols.
Role in Conflicts
Wartime Record
The public record for Gyurza-M in the 2014 Russia-Ukraine War is unusually specific because several named hulls appear in open-source incident analysis, naval loss tracking, Russian-capture reporting, and later Ukrainian river-flotilla coverage.
| Period | Documented record |
|---|---|
| 2018 Kerch Strait | Berdyansk and Nikopol were among the Ukrainian Navy vessels intercepted, fired on, boarded, and captured before later return to Ukraine. |
| 2022 invasion losses | Oryx lists Gyurza-M-class boats among Ukrainian naval losses, including captured boats and Lubny sunk but later raised by Russia. |
| Captured hulls | ArmyInform reports that Russia incorporated Akkerman and Vyshhorod after capture and rearmed them with twin 25 mm artillery mounts. |
| November 2022 strike | The War Zone reported a Ukrainian Navy Gyurza-M hit by a Russian Lancet near Ochakiv and said the boat was expected to be repaired. |
| 2023-2025 | Bucha was commissioned as the final Project 58155 boat, appeared with waterborne mobile fire groups, and was later shown as the river flotilla flagship. |
Profile / Specs
Profile
- Origin
- Ukraine
- Built by
- Kuznya na Rybalskomu
- Type
- Small armored gunboat
- Service note
- 2010s-present
- Designer
- State Research and Design Shipbuilding Center, Mykolaiv
- Designed
- Late 2000s development from the Project 58150 river gunboat concept
- Produced
- 2012-2023
- Number built
- 8 completed
Specifications
- Displacement
- 54 tons
- Length
- 23.0 m
- Beam
- 4.8 m
- Draft
- 1.0 m
- Speed
- 25 knots
- Propulsion
- 2 diesel engines
- Range
- Not less than 900 nautical miles at 12 knots
- Endurance
- 5 days
- Crew
- 5
- Armament
- 2 × KAU-30M / BM-5M.01 Katran-M remote weapon modules, each with a 30 mm ZTM-1 automatic gun, 30 mm KBA-117 grenade launcher, 7.62 mm PKT machine gun, and two Barrier guided anti-tank missiles
- Sensors
- Delta-M navigation radar and Sarmat observation/targeting EOS
- Mission systems
- Navigation radar, optoelectronic monitoring, laser-emission detection sensors, and integrated bridge system
- Production run
- Eight boats completed for Ukrainian Navy service
Mission and Armament Layout
The class is a compact river and coastal patrol boat, but its fit gives it more than police-boat utility: each hull combines sensors, two remote weapon modules, automatic cannon fire, grenade launchers, machine guns, and Barrier guided missiles on a five-person platform.
| Area | Documented detail |
|---|---|
| Patrol role | Designed for harbors, rivers, lakes, territorial waters, isolated areas, and littoral patrol tasks. |
| Weapon modules | Two KAU-30M / BM-5M.01 Katran-M remote modules, each with a 30 mm ZTM-1 cannon, 30 mm KBA-117 grenade launcher, 7.62 mm PKT machine gun, and two Barrier guided missiles. |
| Sensors | Delta-M navigation radar and Sarmat observation/targeting electro-optical system. |
| Scale | About 54 tons displacement, 23.0 m length, 4.8 m beam, 1.0 m draft, 25-knot speed, and a five-person crew. |
Named Hulls
Public sources identify eight completed Project 58155 boats. Seven were in Ukrainian Navy service by September 2020, and the delayed MBAK-08 entered factory trials in early 2023 before commissioning as Bucha.
| Hull | Name | Documented record |
|---|---|---|
| P174 | Akkerman | Listed among the first seven boats; wartime reporting later described it as captured by Russian forces. |
| P175 | Berdiansk / Berdyansk | One of the two Gyurza-M boats seized during the 2018 Kerch Strait incident and later returned to Ukraine. |
| P176 | Nikopol | One of the two Gyurza-M boats seized during the 2018 Kerch Strait incident and later returned to Ukraine. |
| P177 | Kremenchuk | Listed among the first seven boats and later reported captured during the full-scale war. |
| P178 | Lubny | Listed among the first seven boats and later reported sunk during fighting for Mariupol, then raised by Russia in open-source loss tracking. |
| P179 | Vyshhorod | Listed among the first seven boats and later reported captured during the full-scale war. |
| P180 | Kostopil | Listed among the first seven boats in Ukrainian Navy service as of September 2020. |
| MBAK-08 / P181 | Bucha | The eighth and final hull began factory trials on the Dnipro near Kyiv in 2023 and was commissioned into Ukrainian Navy service that May. |
Katran-M Module Weapons
Each Gyurza-M hull carries two KAU-30M / BM-5M.01 Katran-M remote weapon modules, combining cannon, automatic-grenade-launcher, machine-gun, and guided-missile fire from a compact boat.
| Carried item | Item type | Carriage evidence |
|---|---|---|
 | Barrier anti-tank guided missile family | Naval News and Defense Express describe each KAU-30M / Katran-M module on Gyurza-M boats as carrying two Barrier guided anti-tank missiles. Sources: Naval News: Ukraine commissions Gyurza-M-class Gunboat 'Bucha', Defense Express: The Gyurza-M Armored Boat Enhances Anti-Air Defense |
 | 30 mm automatic grenade launcher | Naval News and Defense Express identify a 30 mm KBA-117 automatic grenade launcher in each Katran-M module; the linked catalog record treats KBA-117 as an alias of the DBA-117 / AG17 family. Sources: Naval News: Ukraine commissions Gyurza-M-class Gunboat 'Bucha', Defense Express: The Gyurza-M Armored Boat Enhances Anti-Air Defense |
 | 7.62 mm PKT machine gun | Naval News and Defense Express identify a 7.62 mm PKT machine gun as part of each Katran-M module; the linked catalog record covers PK-family machine guns including PKT aliases. Sources: Naval News: Ukraine commissions Gyurza-M-class Gunboat 'Bucha', Defense Express: The Gyurza-M Armored Boat Enhances Anti-Air Defense |
Optional Grenade Launcher Fit
Public sources describe the standard module fit with KBA-117 grenade launchers, while ARES separately identifies UAG-40 as an option for the Gyurza-M boat family.
| Compatible item | Item type | Compatibility evidence |
|---|---|---|
 | 40 mm automatic grenade launcher option | ARES reports that the UAG-40 can be mounted beyond its tripod configuration and lists it as an option for the Gyurza-M armored artillery boat. |
Timeline
Gyurza-M class gunboat / Project 58155 Key Events
Kerch Strait incident
Bellingcat documented Berdyansk and Nikopol among the Ukrainian vessels intercepted and later captured during the Kerch Strait incident.
Sources: bellingcat: Investigating The Kerch Strait Incident
Naval loss tracking expands
Oryx listed Gyurza-M-class gunboats among the Ukrainian naval losses, including captured boats and Lubny, which was sunk and later raised by Russia.
Sources: Oryx: List Of Naval Losses During The Russian Invasion Of Ukraine
Lancet strike reported near Ochakiv
The War Zone reported a Gyurza-M-class patrol boat struck by a Russian Lancet loitering munition and later identified the target as a Ukrainian Navy vessel near Ochakiv.
Sources: The War Zone: Ukrainian Gunboat Struck By Russian Lancet Loitering Munition (Updated)
Final hull in factory trials
Naval News reported that the eighth and final Project 58155 boat, MBAK-08, had begun factory trials on the Dnipro near Kyiv before entering service as Bucha.
Sources: Naval News: Ukraine's Final Gyurza-M-Class Gunboat Starts Factory Trials near Kyiv
Bucha commissioned
Naval News and ArmyInform reported that Bucha, the final Project 58155 Gyurza-M boat, was accepted into the Ukrainian Navy in Kyiv.
Sources: Naval News: Ukraine commissions Gyurza-M-class Gunboat 'Bucha', ArmyInform: Bucha joins the fleet family
Gyurza air-defense episode reported
Defense Express reported that a Ukrainian Navy Gyurza project armored boat had shot down a Russian Mohajer-6 drone while performing air-defense tasks in late September 2022.
Sources: Defense Express: Ukrainian Navy's Gyurza Project Boat Shoots Down russian Mohajer-6 Drone
Waterborne mobile fire groups shown
Defense Express reported that Bucha appeared in footage of Ukrainian mobile fire groups operating on water in the northern operational zone.
Sources: Defense Express: The Gyurza-M Armored Boat Enhances Anti-Air Defense
Bucha shown as river-flotilla flagship
ArmyInform reported that Ukraine's Navy River Flotilla showed Bucha as its flagship on the Dnipro and described the flotilla as holding waterborne positions and supporting Ukrainian defense forces.
Sources: ArmyInform: Bucha flagship on the Dnipro
Media
Gyurza-M class gunboat / Project 58155 Videos
Related Weapon Systems
Sources
Progress: SMALL ARMORED BOAT GURZA-MPublisher: Progress | Note: Supports the class's mission set and river, harbor, territorial-water, and littoral patrol role. | Accessed: 2026-07-06Naval News: Ukraine commissions Gyurza-M-class Gunboat 'Bucha'Publisher: Naval News | Note: Supports 2014 Russia-Ukraine War direct use: Bucha was commissioned into the Ukrainian Navy during the war, and the article records Gyurza-M boats captured or sunk in the war against Ukraine; also supports final-boat status, manufacturer context, displacement, dimensions, armament, crew, and sensor fit. | Accessed: 2026-07-06Naval News: Ukraine's Final Gyurza-M-Class Gunboat Starts Factory Trials near KyivPublisher: Naval News | Note: Supports the eight-boat production chronology, MBAK designation, named first-seven hull list, Bucha factory-trials timing, designer, builder, armament, dimensions, speed, crew, and sensor fit. | Accessed: 2026-07-06UkrMilitary Pages: Project 58155 MBAK Gyurza-MPublisher: Ukrainian Military Pages | Note: Supports Project 58155/MBAK designation, DPTsK and Kuznya design lineage, production-variant specifications, protection and countermeasure details, and named hull chronology. | Accessed: 2026-07-06SpetsTechnoExport: Gyurza-M Small armored artillery boatPublisher: SpetsTechnoExport | Note: Supports mission wording, sensors and communications, Katran-M weapon fit, Barrier ATGM listing, endurance, displacement, speed, range, crew, and dimensions. | Accessed: 2026-07-06ArmyInform: Bucha joins the fleet familyPublisher: ArmyInform | Note: Supports 2014 Russia-Ukraine War direct use: Bucha was accepted into the Ukrainian Navy on May 26, 2023, assigned to the river flotilla in the Kyiv region, and described as built and tested during active fighting. | Accessed: 2026-07-06bellingcat: Investigating The Kerch Strait IncidentPublisher: bellingcat | Note: Supports 2014 Russia-Ukraine War direct use: the Kerch Strait incident involving the Ukrainian Navy Gyurza-M boats Berdyansk and Nikopol, including interception, fire, boarding, and capture. | Accessed: 2026-07-06Oryx: List Of Naval Losses During The Russian Invasion Of UkrainePublisher: Oryx | Note: Supports 2014 Russia-Ukraine War direct use: the 2022 naval-loss overview listing Gyurza-M-class gunboats among captured, damaged, and sunk-or-raised Ukrainian naval vessels. | Accessed: 2026-07-06The War Zone: Ukrainian Gunboat Struck By Russian Lancet Loitering Munition (Updated)Publisher: The War Zone | Note: Supports 2014 Russia-Ukraine War direct use: the reported Lancet strike on a Ukrainian Navy Gyurza-M class patrol boat near Ochakiv in November 2022. | Accessed: 2026-07-06Defense Express: The Gyurza-M Armored Boat Enhances Anti-Air DefensePublisher: Defense Express | Note: Supports 2014 Russia-Ukraine War direct use: Bucha fielded by Ukrainian naval personnel in waterborne mobile fire groups in the northern operational zone, plus mission, armament, sensor, and speed context. | Accessed: 2026-07-06Defense Express: Ukrainian Navy's Gyurza Project Boat Shoots Down russian Mohajer-6 DronePublisher: Defense Express | Note: Supports 2014 Russia-Ukraine War direct use: Ukrainian Navy Gyurza project armored boats carrying out air-defense tasks, including a reported Mohajer-6 shootdown, defense of Ochakiv, fire support, evacuation operations, and repair after a direct hit. | Accessed: 2026-07-06ArmyInform: Armored shield of river operationsPublisher: ArmyInform | Note: Supports builder naming, development from the Project 58150 river gunboat concept, Project 58155 mission context, the eight-boat production total, and the named hull chronology through Bucha's 2023 entry into service. | Accessed: 2026-07-06ArmyInform: Armored shield of river operations, part IIPublisher: ArmyInform | Note: Supports 2014 Russia-Ukraine War direct use: Kerch Strait capture and return, Azov and Black Sea service, 2022 captured and sunk hulls, Russian incorporation and rearmament of captured Akkerman and Vyshhorod, Ukrainian combat-duty context, Nikopol Lancet damage, and Bucha's July 2023 Dnipro combat-duty role. | Accessed: 2026-07-06ArmyInform: Bucha flagship on the DniproPublisher: ArmyInform | Note: Supports 2014 Russia-Ukraine War direct use: Ukraine's Navy River Flotilla showed Bucha as its flagship on the Dnipro and described ongoing waterborne defensive support. | Accessed: 2026-07-06ARES: Ukrainian UAG-40 automatic grenade launcherPublisher: Armament Research Services | Note: Supports the optional UAG-40 mounting relationship for Gyurza-M armored artillery boats and manufacturer context for that launcher. | Accessed: 2026-07-06Wikimedia Commons: Нікополь P176.jpgPublisher: Wikimedia Commons | Note: Supports the primary image provenance and Creative Commons licensing context. | Accessed: 2026-07-06Wikimedia Commons: Berdyansk damaged gunboat.jpgPublisher: Wikimedia Commons | Note: Supports the gallery image provenance and Creative Commons licensing context. | Accessed: 2026-07-06Wikimedia Commons: Comissioning ceremony of P181 Bucha, 2023.05.26 (05).jpgPublisher: Wikimedia Commons | Note: Supports the gallery image provenance and Creative Commons licensing context. | Accessed: 2026-07-06Wikimedia Commons: KAU-30M gun and Gyurza-M boat.jpgPublisher: Wikimedia Commons | Note: Supports the gallery image provenance and Creative Commons licensing context. | Accessed: 2026-07-06