Infantry Weapons

20mm GIAT M621 autocannon

Also known as
  • M621
  • 20M621
  • 20 M621
  • GIAT M621
  • Nexter M621
  • KNDS 20M621
  • Canon 20mm M621

The GIAT M621, now marketed by KNDS France as the 20M621, is a compact French 20x102 mm autocannon used as the gun core for light vehicle, helicopter, aircraft-pod, and naval mounts. Official KNDS material describes it as a gas-operated cannon with electrical priming, 250 daN recoil, 49 kg weapon weight, and integration across SH20, NC621, THL20, Narwhal, P20, and ARX20 mount families.

20mm GIAT M621 autocannon, French 20x102 mm gas-operated autocannon, Infantry Weapons
Image source: 20M621 | KNDS Group
Profile / Specs

Profile

Origin
France
Type
French 20x102 mm gas-operated autocannon
Service note
Modern
Designer
GIAT Industries / KNDS France
Produced
In production under KNDS France
Developed into
20mm GIAT M693 autocannon

Specifications

Caliber
20x102 mm NATO
Operation
Gas operated
Firing modes
Single round, limited burst, and unlimited burst
Priming
Electrical
Feed
Simple feed
Weapon weight
49 kg
Length
2.228 m
Rate of fire
Approximately 750 rounds per minute in KNDS mount literature
Average recoil force
250 daN
Recocking
Manual, with remote recocking optional
Effective range
Up to 2,000 m in KNDS 20M621 and mount literature
Ammunition family
HEI, armor-piercing, tracer, and training rounds are listed across KNDS 20M621 and 20x102 mm materials
Known KNDS mounts
SH20, NC621, THL20, Narwhal, P20, and ARX20
Variants

Public sources describe the M621/20M621 primarily by the mounts built around the gun rather than by separate gun variants.

VariantConfigurationDesignation notes
THL20Under-cabin helicopter turret

KNDS describes THL20 as a helicopter turret developed around the 20 M621 cannon and qualified or integrated on IAR 330, Indian ALH/LCH, and Black Hawk platforms.

Sources: THL20 | KNDS Group

20 mm gun pod, Aircraft gun pod, MunitionsNC621Aircraft gun pod

KNDS says the NC621 pod is developed around the 20M621 cannon, carries 180 rounds, and uses 20x102 mm NATO ammunition for helicopter and light-aircraft applications.

Sources: NC621 | KNDS Group

P20Manual vehicle pintle or ring mount

KNDS identifies P20 as a light-vehicle armament using the 20M621 gas-reloaded gun and 20x102 mm NATO ammunition.

Sources: P20 | KNDS Group

ARX20Land remote weapon station

KNDS lists ARX20 with an available 20M621 20x102 mm NATO configuration, 250 daN average recoil, and day/night stabilized remote operation.

Sources: ARX20 | KNDS Group

Narwhal 20 mm remote-controlled turret, 20 mm naval remote weapon station, Naval SystemsNarwhal 20ANaval remote weapon station configuration

KNDS 20x102 mm ammunition material says the family is qualified on 20M621 mounted on Narwhal, while MBDA describes Narwhal's 20M621 gun in the remote naval turret context.

Sources: 20x102MM | KNDS Group, Euronaval 2022 Narwhal Akeron MP | MBDA

20mm GIAT M693 autocannon, French 20 mm autocannon chambered for 20x139mm NATO rounds, Infantry WeaponsM693Larger 20x139 mm related gun family

Weaponsystems.net describes the M693 as based on the earlier M621 autocannon while changing to 20x139 mm NATO ammunition.

Sources: Weaponsystems.net 20mm Giat M693

Mounts And Related Systems

The M621 page is a component record for the gun. Existing catalog pages below cover sourced mounts or related cannon families rather than independent conflict use by the bare gun.

Compatible itemItem typeCompatibility evidence
20 mm gun pod, Aircraft gun pod, Munitions20 mm gun podAircraft gun pod

The NC621 pod is built around the 20M621 cannon, uses 20x102 mm NATO ammunition, and carries 180 rounds for helicopter, light-aircraft, and drone-compatible applications.

Sources: NC621 | KNDS Group

Narwhal 20 mm remote-controlled turret, 20 mm naval remote weapon station, Naval SystemsNarwhal 20 mm remote-controlled turretNaval remote weapon station

Narwhal's 20A ammunition standard uses the 20M621/20x102 mm combination, while the existing Narwhal catalog record covers the complete remotely operated naval turret family.

Sources: 20x102MM | KNDS Group, Euronaval 2022 Narwhal Akeron MP | MBDA

20mm GIAT M693 autocannon, French 20 mm autocannon chambered for 20x139mm NATO rounds, Infantry Weapons20mm GIAT M693 autocannonRelated 20 mm autocannon family

The M693 record covers the larger 20x139 mm family that specialist references trace back to the earlier M621 design.

Sources: Weaponsystems.net 20mm Giat M693

Why this is a component page

Official and specialist sources support the gun's specifications, mount families, and relationship to existing catalog entries, but this research pass did not find direct evidence for a named-conflict use row for the M621 gun itself.

Sources: 20M621 | KNDS Group, Rafale Mirage Tiger airborne medium-caliber release | KNDS Group

Mount Family Context

The 20M621 is best read as a gun core used across several KNDS France installations rather than as a standalone vehicle or turret. KNDS names six mount families built around it: SH20, NC621, THL20, Narwhal, P20, and ARX20.

Aircraft and helicopter use

KNDS ties the 20M621 to THL20 under-cabin turrets, NC621 pods, and SH20 door mounts, with public product pages giving 20x102 mm ammunition and low-recoil integration context.

Land and naval use

P20 and ARX20 adapt the gun to vehicle mounts, while Narwhal 20A adapts the 20M621/20x102 mm standard to a naval remote weapon station.

Catalog boundary

Named conflicts belong on the complete mount or platform only when direct sources support that exact weapon-conflict pair. This page therefore links mount families without copying Narwhal or aircraft-pod conflict context.

Sources: 20M621 | KNDS Group; THL20 | KNDS Group; NC621 | KNDS Group; P20 | KNDS Group; ARX20 | KNDS Group; 20x102MM | KNDS Group.

Timeline

20mm GIAT M621 autocannon Key Events

  1. ARX20 export-era promotion

    Contemporary specialist coverage described Nexter's ARX20 remote weapon station as a 20M621-armed system intended to bridge the capability gap between 12.7 mm remote stations and heavier 25-30 mm turrets.

    Sources: ARX20 Remotely Controlled Weapon Station | Defense Update

  2. Narwhal missile-kit configuration publicized

    MBDA and Nexter presented an Akeron MP missile kit for Narwhal and described the 20 mm remote turret as effective beyond 2,000 m thanks to its 20M621 gun.

    Sources: Euronaval 2022 Narwhal Akeron MP | MBDA

  3. KNDS highlights airborne 20M621 mount family

    KNDS France described 20M621-based airborne solutions including THL20, the pod-mounted 20M621/NC621 family, and SH20, with production increases for 20 mm mounts.

    Sources: Rafale Mirage Tiger airborne medium-caliber release | KNDS Group

Media

20mm GIAT M621 autocannon Images

20mm GIAT M621 autocannon, French 20x102 mm gas-operated autocannon, Infantry Weapons - view 1
Source: 20M621 | KNDS Group
Related Weapon Systems
20mm GIAT M693 autocannon, French 20 mm autocannon chambered for 20x139mm NATO rounds, Infantry WeaponsInfantry Weapons20mm GIAT M693 autocannonFrench 20 mm autocannon chambered for 20x139mm NATO roundsThe GIAT M693 is a French 20 mm autocannon family developed for armored-vehicle, anti-aircraft, and naval mount applications. Specialist references trace the gun to the earlier M621 mechanism but a larger 20x139 mm NATO cartridge, dual-belt feed, and about 900 rounds per minute. The catalog keeps it as a relationship-only component page because public sources most clearly document the M693 through host platforms and derivatives: AMX-10P vehicles, naval 20F2 mounts, Narwhal 20B turrets, and the South African GI2 production variant.
Narwhal 20 mm remote-controlled turret, 20 mm naval remote weapon station, Naval SystemsNaval SystemsNarwhal 20 mm remote-controlled turret20 mm naval remote weapon stationNarwhal is KNDS France's remotely operated 20 mm naval turret family for close-in ship self-defense and maritime-security roles. Official KNDS and MBDA material describes it as a lightweight day/night system for platforms from small patrol boats to frigates, with 20A and 20B ammunition-standard configurations, more than 180 systems in service, demonstrated Akeron MP missile pods, and a future 30 mm growth direction.
2A72 30 mm automatic cannon, 30 mm dual-feed automatic cannon, ArtilleryArtillery2A72 30 mm automatic cannon30 mm dual-feed automatic cannonThe 2A72 is a Russian 30x165 mm dual-feed automatic cannon designed by KBP Instrument Design Bureau and manufactured by Tulamashzavod Joint Stock Company. It is a lighter, recoil-operated 2A42-family gun used as a coaxial cannon on BMP-3 and BMD-4M-type turrets and as the main weapon on 30 mm BTR-80A/BTR-82A installations, with direct open-source reporting tying BTR-82A 2A72 fire to fighting near Latakia during the 2011 Syrian Civil War.
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20mm M197 rotary cannon, 20 mm three-barrel externally powered Gatling aircraft cannon, Aircraft & UAVsAircraft & UAVs20mm M197 rotary cannon20 mm three-barrel externally powered Gatling aircraft cannonThe 20mm M197 is a lightweight three-barrel Gatling aircraft cannon derived from the M61A1 Vulcan family for helicopter, light-aircraft, naval, turret, pod, and pintle installations. General Dynamics Ordnance and Tactical Systems markets the current M-197 and lists it on Marine Corps AH-1J, AH-1T, AH-1W, and AH-1Z aircraft, while FAS, DVIDS, Defense Media Network, and official Navy history sources document M197-equipped AH-1W and MH-60S context across Gulf War, Afghanistan, Iraq, and Operation Inherent Resolve service.

Sources

20M621 | KNDS GroupPublisher: KNDS Group | Note: Supports current KNDS 20M621 product identity, French manufacturer context, 20x102 mm ammunition, gas operation, firing modes, recoil, priming, weight, length, named mount families, and official image provenance. | Accessed: 2026-07-06NC621 | KNDS GroupPublisher: KNDS Group | Note: Supports the NC621 pod relationship to the 20M621 cannon, 20x102 mm ammunition, 180-round capacity, 750 rounds/min firing rate, and aircraft-pod integration context. | Accessed: 2026-07-06THL20 | KNDS GroupPublisher: KNDS Group | Note: Supports THL20 as a helicopter turret developed around the 20 M621 cannon, plus ammunition, integration, qualified platform, onboard ammunition, traverse/elevation, range, and recoil context. | Accessed: 2026-07-06P20 | KNDS GroupPublisher: KNDS Group | Note: Supports P20 as a light-vehicle mount using the 20M621 gas-reloaded gun and NATO 20x102 mm ammunition, with rate-of-fire and vehicle integration context. | Accessed: 2026-07-06ARX20 | KNDS GroupPublisher: KNDS Group | Note: Supports ARX20 as a remote weapon station available with the 20M621 20x102 mm NATO configuration, including recoil, stabilization, sighting, and integration details. | Accessed: 2026-07-0620x102MM | KNDS GroupPublisher: KNDS Group | Note: Supports 20x102 mm ammunition compatibility with 20M621, Narwhal and THL20 mount context, and AP-T cartridge performance characteristics. | Accessed: 2026-07-06Rafale Mirage Tiger airborne medium-caliber release | KNDS GroupPublisher: KNDS Group | Note: Supports current KNDS France airborne medium-caliber production context, Bourges manufacturing, 20M621-based THL20, pod-mounted, and SH20 airborne solutions, and recent production-rate context. | Accessed: 2026-07-06Euronaval 2022 Narwhal Akeron MP | MBDAPublisher: MBDA | Note: Supports Narwhal remote-turret context, integration on small patrol boats through frigates, Akeron MP kit context, and the 20M621 gun's role in the Narwhal configuration. | Accessed: 2026-07-06Weaponsystems.net 20mm Giat M693Publisher: Weaponsystems.net | Note: Supports the related M693 family context, including specialist-reference treatment of the M693 as based on the earlier M621 design. | Accessed: 2026-07-06ARX20 Remotely Controlled Weapon Station | Defense UpdatePublisher: Defense Update | Note: Supports dated specialist context for Nexter's ARX20 remote weapon station and its 20M621/20x102 mm cannon fit. | Accessed: 2026-07-06