Munitions

OFS 13 round

Also known as
  • OFS-13
  • OFS 13
  • 120 mm OFS 13

OFS 13 is a Russian 120 mm high-explosive projectile documented in open reporting as a firing option for the 2S40 Floks gun-mortar. Defense Express lists it as a 17.3 kg round reaching about 8.5 km from the Floks, while Rostec describes the platform's broader ability to fire both mortar and rifled-projectile ammunition.

OFS 13 round, 120 mm high-explosive gun-mortar projectile, Munitions
Image source: File:2S40 Flox.jpg
Profile / Specs

Specifications

Designation
OFS 13
Caliber
120 mm
Munition type
High-explosive projectile
Reported mass
17.3 kg
Reported range from 2S40 Floks
About 8.5 km
Firing system context
2A80 120 mm gun on the 2S40 Floks wheeled self-propelled howitzer/mortar
Firing Platform

OFS 13 is publicly documented through the 2S40 Floks ammunition set. Rostec describes the Floks as a 120 mm system able to use both mortar and rifled-projectile ammunition, and Defense Express gives OFS 13-specific firing data for that platform.

Firing weaponWeapon typeFiring evidence
2S40 Floks, 120 mm wheeled self-propelled howitzer/mortar, Artillery2S40 Floks120 mm wheeled self-propelled howitzer/mortar

Defense Express lists the 2S40 Floks as firing the OFS 13 high-explosive round and reports a 17.3 kg mass and about 8.5 km range for that ammunition option.

Sources: New Russian 2S40 Floks Howitzer Just Delivered, Next Day First One Gets Hit in Ukraine

Why the relationship matters

The open-source evidence ties OFS 13 to the Floks' hybrid mortar/projectile role rather than to a standalone factory datasheet, so the firing-platform relationship is the strongest documented context for the round.

Sources: New Russian 2S40 Floks Howitzer Just Delivered, Next Day First One Gets Hit in Ukraine, Floks Self-Propelled Artillery Gun: a Canon, a Howitzer and a Mortar All in One

Floks Ammunition Context

The published OFS 13 data appears inside reporting on the 2S40 Floks rather than in a standalone munition catalog. That context matters because the Floks is described as a 120 mm system built to use both mortar ammunition and rifled projectiles.

Ammunition itemRoleDocumented context
OFS 13High-explosive projectileDefense Express lists a 17.3 kg round with about 8.5 km range from the 2S40 Floks.
OFM120 mm roundThe same Defense Express firing table gives OFM a shorter reported range of about 7.2 km from the Floks.
Kitolov-2MGuided munition optionDefense Express and Army Recognition both place Kitolov-2M in the Floks ammunition set, with reporting describing it as the longer-range precision option.

Rostec's Floks description explains the mixed ammunition logic: mortar projectiles and rifled projectiles stabilize differently, giving the system a broader firing envelope than a conventional single-purpose mortar.

Timeline

OFS 13 round Key Events

  1. 2S40 Floks unveiled

    Army Recognition places the 2S40 Phlox/Floks public unveiling at the Army 2016 defense exhibition and describes it as a 120 mm system combining mortar and howitzer roles.

    Sources: Phlox or Floks 2S40

  2. First Floks batch delivered

    Defense Express reported that Rostec announced the first batch of Floks self-propelled guns had reached Russian forces on October 6, 2023; Rostec later described the delivery as occurring in October 2023.

    Sources: New Russian 2S40 Floks Howitzer Just Delivered, Next Day First One Gets Hit in Ukraine, Floks Self-Propelled Artillery Gun: a Canon, a Howitzer and a Mortar All in One

  3. OFS 13 reported in Floks firing data

    Defense Express listed OFS 13 among the 2S40 Floks ammunition options, with a reported 17.3 kg mass and an 8.5 km range from that system.

    Sources: New Russian 2S40 Floks Howitzer Just Delivered, Next Day First One Gets Hit in Ukraine

Related Weapon Systems
OFM round, 120 mm mortar/artillery ammunition, MunitionsMunitionsOFM round120 mm mortar/artillery ammunitionThe OFM round is a 120 mm ammunition label associated with Russia's 2S40 Floks wheeled gun-mortar. Defense Express lists OFM alongside OFS 13 and Kitolov-2M and reports about 7.2 km range from the Floks, while Rostec and Army Recognition describe the platform as able to fire both mortar-style and rifled-projectile ammunition. The cited public sources tie OFM to Floks compatibility rather than standalone battlefield use, so this remains a relationship-only ammunition page.
2S40 Floks, 120 mm wheeled self-propelled howitzer/mortar, ArtilleryArtillery2S40 Floks120 mm wheeled self-propelled howitzer/mortarThe 2S40 Floks is a Russian 120 mm wheeled self-propelled gun-mortar developed by Burevestnik under the Nabrosok artillery program and mounted on an armored Ural-4320 6x6 chassis. Open reporting ties it to Russian battlefield use in Ukraine from October 2023, where Ukrainian drone units documented strikes against newly fielded systems while Rostec and defense references describe the platform's combined mortar, howitzer-style indirect-fire, and direct-fire roles.
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2S34 Chosta, 120 mm tracked self-propelled gun-mortar, ArtilleryArtillery2S34 Chosta120 mm tracked self-propelled gun-mortarThe 2S34 Chosta is a Russian 120 mm tracked self-propelled gun-mortar that rebuilds the 2S1 Gvozdika chassis around the 2A80-1 weapon, an automatic loading system, and updated fire-control equipment. It gives Russian artillery units a compact turreted vehicle able to fire mortar-style high-angle missions, direct fire, and some guided 120 mm ammunition, but public reporting suggests only a small fleet reached service before examples appeared in Ukraine.
3VOF54 / 3OF49 high-explosive fragmentation round, 120 mm rifled gun-mortar HE-fragmentation semi-fixed round and projectile family, MunitionsMunitions3VOF54 / 3OF49 high-explosive fragmentation round120 mm rifled gun-mortar HE-fragmentation semi-fixed round and projectile familyThe 3OF49 is the HE-fragmentation projectile used in Soviet and Russian Nona-family 120 mm semi-fixed ammunition. METIS distinguishes the projectile from complete rounds: 3VOF54 combines 3OF49 with the 3V35 impact fuze, while 3VOF54-1 uses the AR-5 radio/proximity fuze. Belspetsvneshtechnika lists both fuze configurations for the 2S9 Nona-S, and VPK attributes Nona ammunition development to Basalt.

Sources

New Russian 2S40 Floks Howitzer Just Delivered, Next Day First One Gets Hit in UkrainePublisher: Defense Express | Note: Supports OFS 13 as a reported 2S40 Floks ammunition option, including the 17.3 kg mass, about 8.5 km range, 2A80 gun context, and the related OFM and Kitolov-2M comparison rows. | Accessed: 2026-06-29Floks Self-Propelled Artillery Gun: a Canon, a Howitzer and a Mortar All in OnePublisher: Rostec | Note: Supports official Floks background, the 120 mm rifled-gun role, the ability to use both mortar and rifled-projectile ammunition, and October 2023 first-batch delivery context. | Accessed: 2026-06-29Phlox or Floks 2S40Publisher: Army Recognition | Note: Supports 2S40 Phlox/Floks background, Army 2016 unveiling context, 2A80 120 mm mortar/howitzer description, ammunition capacity, and general ammunition-class context. | Accessed: 2026-06-29Imminent Deployment of Russia's New Phlox 120mm Self-Propelled Mortar Carrier in UkrainePublisher: Army Recognition | Note: Supports the broader Floks ammunition set, including high-explosive fragmentation, smoke, 120 mm mortar-shell compatibility, and Kitolov-2M precision-munition context. | Accessed: 2026-06-29File:2S40 Flox.jpgPublisher: Wikimedia Commons | Note: Supports image provenance and reuse context for the 2S40 Floks image used to show the documented firing platform for this relationship-only ammunition page. | Accessed: 2026-06-29