Armored Vehicles

PRP-4 Nard / PRP-4M Deyteriy

Also known as
  • PRP-4
  • PRP-4M
  • Nard
  • Deyteriy
  • Deuteriy
  • Deyterium
  • 1V121
  • 1V125
  • 1V145
  • Object 779
  • Object 779M
  • Podvizhny Razvedyvatelny Punkt PRP-4

The PRP-4 Nard and PRP-4M Deyteriy are BMP-1-derived Soviet artillery reconnaissance vehicles built to find targets, determine coordinates, and support artillery fire direction from a protected tracked platform. The family trades the BMP-1 infantry role for radar, optical, night-vision, navigation, data-link, and laser ranging equipment, with later PRP-4A Argus vehicles continuing the same artillery-observation line in Russian service.

PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles
Image source: Wikimedia Commons PRP-4M 1

Role in Conflicts

Profile / Specs

Profile

Origin
Soviet Union / Russia
Type
Artillery reconnaissance vehicle
Service note
Late Cold War and post-Soviet service
Designer
Rubtsovsk Machine-Building Plant
Designed
PRP-4 development began in 1980; PRP-4 accepted in 1984; PRP-4M modernization appeared in 1988
Produced
PRP-4 serial production from the mid-1980s at Rubtsovsk Machine-Building Plant; PRP-4M followed from 1988; PRP-4MU and PRP-4A were later upgrades or follow-ons with limited public production evidence

Specifications

Crew
5 on PRP-4, PRP-4M, and PRP-4MU in detailed PRP-family comparison data; PRP-4A references commonly list a crew of 4
Chassis
BMP-1-derived tracked amphibious chassis for PRP-4 and PRP-4M; PRP-4A chassis reporting is inconsistent between open sources
Combat weight
PRP-4: about 13,200 kg; PRP-4M/PRP-4MU: about 13,150 kg; PRP-4A: 13,800 kg in PRP-4A references
Engine and mobility
UTD-20-family 300 hp diesel; 65 km/h road speed; about 7 km/h swimming speed; 550-600 km fuel range depending on variant
Armament
One 7.62 mm PKT or PKTM machine gun for self-defense, with 1,000 rounds listed for PRP-4/PRP-4M/PRP-4MU
Protection
BMP-family welded armored hull with about 6-26 mm armor cited for PRP-4/PRP-4M/PRP-4MU; later Argus references add camouflage, smoke, and protection aids
Sensors
PRP-4/PRP-4M equipment includes PSNR-5K/1RL133-1 Kredo battlefield-surveillance radar, optical/night observation devices, laser rangefinders, navigation equipment, and artillery command/data-transmission equipment depending on variant
PRP-4M detection and targeting
Technical comparison data lists PRP-4M target recognition up to 3,000 m by day or night, tank-type radar detection up to 12,000 m, target fixing up to 10,000 m, and equipment readiness within 5 minutes
PRP-4MU distinction
PRP-4MU is described as replacing the PRP-4/PRP-4M 1RL133-1 radar with the 1RL133-3 radar
PRP-4A Argus distinction
Later Argus references describe thermal imaging, laser rangefinding, radar, range-gated imaging, optoelectronic suppression, smoke equipment, and faster readiness than PRP-4M
Reconnaissance Fit

The PRP-4 family replaced the BMP-1's infantry-carrying role with an artillery observation package. Open references describe radar, optical and night-vision devices, navigation aids, data-transmission equipment, laser rangefinders, and a small defensive machine gun as the core of the vehicle's battlefield role.

Battlefield role

Locate ground targets, determine coordinates, and help artillery units correct or direct fire from a tracked armored observation post.

Vehicle lineage

BMP-1-derived hull with specialist reconnaissance systems instead of the standard infantry fighting vehicle mission package; Rubtsovsk records and reference sources tie PRP modernization work to the same tracked-vehicle industrial line.

Designation caution

PRP-4 Nard is most often identified as 1V121, PRP-4M Deyteriy as 1V145, and Ukraine-war loss trackers as 1V125/145 PRP-4(M).

Variants

The family uses both GRAU-style equipment indexes and factory/object names: PRP-4 Nard is identified as 1V121/Object 779, PRP-4M Deyteriy as 1V145/Object 779M, PRP-4A Argus as 1V166, while Ukraine-war loss trackers often group observed vehicles under the 1V125/145 PRP-4(M) label.

VariantConfigurationDesignation notes
PRP-4MULate PRP-4M upgrade

Described as a late-1990s improved PRP-4M standard that replaced the 1RL133-1 radar with 1RL133-3; open sources suggest upgrades may have been applied during overhaul rather than large new-build production.

Sources: Armforc PRP-4 Nard and PRP-4M Deyteriy

PRP-4A ArgusLater Russian follow-on

Identified as 1V166 and associated with Rubtsovsk/Uralvagonzavod; sources describe improved reconnaissance and observation equipment, thermal imaging, optoelectronic suppression, and Russian district-service introduction as a replacement for older PRP-4 vehicles.

Sources: Army Recognition PRP-4A Argus, VPK TSAMTO PRP-4A Demonstration, Voprosy Oboronnoy Tekhniki Fire-Control Vehicles

Vehicle Family

The PRP-4 family is a specialist artillery-observation branch of the BMP-1 tracked vehicle family rather than a troop-carrying infantry fighting vehicle.

Compatible itemItem typeCompatibility evidence
BMP-1, Infantry fighting vehicle, Armored VehiclesBMP-1Base tracked vehicle family

Army Recognition describes the PRP-4A Argus as BMP-1-based, and reference material groups PRP-4/PRP-4M among BMP-1-derived specialist variants.

Sources: Army Recognition PRP-4A Argus, List of BMP-1 variants

Timeline

PRP-4 Nard / PRP-4M Deyteriy Key Events

  1. PRP-4 enters Soviet service

    Armforc describes PRP-4 Nard development beginning in 1980 as a deep modernization of the PRP-3, with acceptance in 1984 as the 1V121 PRP-4 Nard.

    Sources: Armforc PRP-4 Nard and PRP-4M Deyteriy

  2. PRP-4M modernization appears

    Armforc identifies PRP-4M Deyteriy/Object 779M/1V145 as a 1988 modernization with improved radar, optical reconnaissance, and communications equipment.

    Sources: Armforc PRP-4 Nard and PRP-4M Deyteriy, Soviet GRAU Index Archive

  3. PRP-4A Argus reported in Russian district service

    Army Recognition reported Russian Central and Southern Military District artillery units mastering PRP-4A Argus vehicles as replacements for legacy PRP-4 Nard fire-control vehicles.

    Sources: Army Recognition PRP-4A Argus

  4. Central Military District demonstrates PRP-4A Argus

    TSAMTO reporting republished by VPK.name said a PRP-4A Argus was shown to Central Military District artillery commanders and described the vehicle's thermal imaging, target search, and fire-support role.

    Sources: VPK TSAMTO PRP-4A Demonstration

  5. Russian PRP-4(M) losses tracked in Ukraine

    Oryx's full-scale invasion loss list separately records Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle losses and a PRP-4A Argus captured item.

    Sources: Oryx Russian Equipment Losses

  6. Two PRP-4 vehicles reported destroyed near Myrnohrad

    UNITED24 Media reported that Ukraine's 503rd Separate Marine Battalion published video from a failed Russian assault near Myrnohrad in which two PRP-4 reconnaissance vehicles were destroyed; WarSpotting records two Russian PRP-4(M) losses at nearby Razine on 5 November 2025.

    Sources: UNITED24 Myrnohrad PRP-4 Losses, WarSpotting PRP-4M 40578, WarSpotting PRP-4M 40579

  7. WarSpotting records a destroyed PRP-4(M)

    WarSpotting entry #43094 identifies a destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle on 25 February 2026.

    Sources: WarSpotting PRP-4M 43094

Media

PRP-4 Nard / PRP-4M Deyteriy Images

PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles - view 1
Source: Wikimedia Commons PRP-4M 2
PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles - view 2
Source: Wikimedia Commons PRP-4M 3
PRP-4 Nard / PRP-4M Deyteriy, Artillery reconnaissance vehicle, Armored Vehicles - view 3
Source: Wikimedia Commons PRP-4A Argus 514
Related Weapon Systems
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BRM-1K, Tracked armored reconnaissance vehicle, Armored VehiclesArmored VehiclesBRM-1KTracked armored reconnaissance vehicleThe BRM-1K is a Soviet tracked armored reconnaissance vehicle derived from the BMP-1 chassis, combining amphibious mobility with battlefield surveillance equipment and a 73 mm 2A28 cannon. Russia later modernized the type as the BRM-1KM/BRM-1K Model 2021 with a BTR-82A-style combat compartment, 30 mm 2A72 armament, updated communications, and newer reconnaissance equipment; both legacy and modernized vehicles are visually documented in post-Soviet conflicts.

Sources

List of BMP-1 variantsPublisher: Wikipedia | Note: Starting reference for PRP-4 and PRP-4M designation logic, BMP-1 family placement, variant equipment, and source leads. | Accessed: 2026-07-01Soviet GRAU Index ArchivePublisher: Archive.today mirror of Russian GRAU index list | Note: Supports the 1V121 PRP-4 Nard, 1V145 PRP-4M Deyteriy, and 1V166 PRP-4A Argus designation mapping; used cautiously as an archived index reference. | Accessed: 2026-07-01Army Recognition PRP-4A ArgusPublisher: Army Recognition | Note: Supports PRP-4A Argus specifications, BMP-1 base vehicle, Rubtsovsk design lineage, Russian district service context, and replacement relationship to PRP-4 Nard. | Accessed: 2026-07-01GlobalSecurity Rubtsovsk PlantPublisher: GlobalSecurity.org | Note: Supports Rubtsovsk Machine-Building Plant tracked-vehicle background, BMP-1 cooperation, PRP-3 production, and PRP modernization article sequence from 1984 to 1999. | Accessed: 2026-07-01Armforc PRP-4 Nard and PRP-4M DeyteriyPublisher: Armforc.su | Note: Detailed Russian-language reference supporting PRP-4/PRP-4M designation logic, development chronology, Rubtsovsk serial production, PRP-4MU radar distinction, equipment fit, and PRP-4/4M/4MU comparison specifications. | Accessed: 2026-07-02Voprosy Oboronnoy Tekhniki Fire-Control VehiclesPublisher: Voprosy Oboronnoy Tekhniki | Note: 2022 technical journal article comparing artillery fire-control command and reconnaissance vehicles; supports 1V145 Deyteriy and 1V166 Argus designations, PRP organizational role, and PRP-4M/PRP-4A technical comparison data. | Accessed: 2026-07-02VPK TSAMTO PRP-4A DemonstrationPublisher: VPK.name / TSAMTO | Note: Supports PRP-4A Argus Central Military District demonstration context, target-search role, thermal imaging and optoelectronic fit, and artillery targeting support. | Accessed: 2026-07-01UINP Popasna PRP-4 Nard AccountPublisher: Ukrainian Institute of National Memory | Note: Supports direct 2014 Russia-Ukraine War use of a Ukrainian PRP-4 Nard crew during the July 2014 Popasna fighting. | Accessed: 2026-07-02Oryx Russian Equipment LossesPublisher: Oryx | Note: Supports direct 2014 Russia-Ukraine War documentation of Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle losses during the full-scale invasion. | Accessed: 2026-07-01UNITED24 Myrnohrad PRP-4 LossesPublisher: UNITED24 Media | Note: Supports direct 2014 Russia-Ukraine War documentation of two Russian PRP-4 reconnaissance vehicles destroyed near Myrnohrad after a 503rd Separate Marine Battalion video. | Accessed: 2026-07-01WarSpotting PRP-4M 40578Publisher: WarSpotting | Note: Supports direct 2014 Russia-Ukraine War documentation of a destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle at Razine on 5 November 2025. | Accessed: 2026-07-02WarSpotting PRP-4M 40579Publisher: WarSpotting | Note: Supports direct 2014 Russia-Ukraine War documentation of a second destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle at Razine on 5 November 2025. | Accessed: 2026-07-02WarSpotting PRP-4M 43094Publisher: WarSpotting | Note: Supports direct 2014 Russia-Ukraine War documentation of a destroyed Russian 1V125/145 PRP-4(M) Nard/Deyteriy artillery reconnaissance vehicle on 25 February 2026. | Accessed: 2026-07-01Wikimedia Commons PRP-4A Argus 514Publisher: Wikimedia Commons | Note: Supports PRP-4A Argus gallery image provenance and CC BY-SA 4.0 licensing by Vitaly V. Kuzmin with VRT confirmation. | Accessed: 2026-07-02Wikimedia Commons PRP-4M 1Publisher: Wikimedia Commons | Note: Supports the primary PRP-4M image provenance and CC BY-SA 4.0 licensing by Vitaly V. Kuzmin with VRT confirmation. | Accessed: 2026-07-01Wikimedia Commons PRP-4M 2Publisher: Wikimedia Commons | Note: Supports additional PRP-4M gallery image provenance and CC BY-SA 4.0 licensing. | Accessed: 2026-07-01Wikimedia Commons PRP-4M 3Publisher: Wikimedia Commons | Note: Supports additional PRP-4M gallery image provenance and CC BY-SA 4.0 licensing. | Accessed: 2026-07-01