Munitions

C90-CR-BK (M3.5)

Also known as
  • C90-CR-BK
  • C90-CR-BK (M3)
  • C90BK
  • C90-BK
  • C-90-CR-BK

The C90-CR-BK (M3.5) is Instalaza's 90 mm anti-bunker load for the C90-CR disposable launcher family, intended to put a follow-through effect inside buildings or field fortifications rather than serve as the family's main anti-tank round. Instalaza lists the M3.5 BK at 5.4 kg in transport configuration, 300 m effective range against area targets, 140 mm armor-steel penetration, and 300 mm concrete penetration.

C90-CR-BK (M3.5), 90 mm anti-bunker munition, Munitions
Image source: C90-CR (M3.5) Weapon System
Conflict Evidence Limit

Public conflict reporting identifies C90-series launchers in Yemen and Spanish grenade-launcher transfers to Ukraine, but the cited conflict material does not identify the C90-CR-BK (M3.5) anti-bunker load as fielded by a specific conflict side. This record therefore remains a relationship-only munition page linked to the C90 launcher family rather than a conflict-backed weapon entry.

Profile / Specs

Profile

Origin
Spain
Type
90 mm anti-bunker munition
Service note
Modern C90-family ammunition
Designer
Instalaza S.A.

Specifications

Caliber
90 mm
Type
Anti-bunker munition
Weight
5.4 kg (transport configuration)
Effective range
300 m against area targets
Armor penetration
140 mm armor steel
Penetration
300 mm concrete
Fragments
> 400 inside the bunker
Launcher compatibility
C90-CR (M3.5)
Variants

Instalaza presents the M3.5 C90-CR line as four 90 mm loads for the same disposable launcher: RB anti-tank, AM dual-purpose, FIM smoke, and BK anti-bunker.

VariantConfigurationDesignation notes
C90-CR-RB (M3.5), Anti-tank 90 mm munition, MunitionsC90-CR-RB (M3.5)Anti-tank load

Instalaza lists RB as the C90-CR (M3.5) anti-tank munition, separate from the BK anti-bunker load.

Sources: C90-CR (M3.5) Weapon System

C90-CR-AM (M3.5) dual-purpose munition, Dual-purpose anti-armour and fragmentation 90 mm munition, MunitionsC90-CR-AM (M3.5) dual-purpose munitionDual-purpose load

Instalaza lists AM as the C90-CR (M3.5) dual-purpose anti-armour and fragmentation munition.

Sources: C90-CR (M3.5) Weapon System

C90-CR-FIM (M3.5) smoke munition, Smoke 90 mm munition, MunitionsC90-CR-FIM (M3.5) smoke munitionSmoke load

Instalaza lists FIM as the C90-CR (M3.5) smoke munition, giving it the highest transport weight in the four-round table.

Sources: C90-CR (M3.5) Weapon System

Compatible Launchers

Instalaza lists C90-CR-BK (M3.5) as one of the munitions in the C90-CR disposable weapon system.

Firing weaponWeapon typeFiring evidence
Instalaza C-90 / C90-CR, Disposable 90 mm shoulder-fired rocket launcher, Infantry WeaponsInstalaza C-90 / C90-CRDisposable 90 mm launcher

Instalaza's C90-CR (M3.5) page lists C90-CR-BK (M3.5) as the anti-bunker munition in the C90 family.

Sources: C90-CR (M3.5) Weapon System

Why this page is separate

The launcher record covers the broader C90 / C90-CR weapon system. This munition record preserves the distinct BK anti-bunker specifications and same-family links without inheriting conflict use that is only documented at the launcher-family level.

Sources: C90-CR (M3.5) Weapon System, Spanish C90-CR Rocket Launchers and Alhambra Hand Grenades in Yemen

Role In The C90 Family

The BK load is the anti-bunker branch of the 90 mm C90 family. The disposable C90-CR (M3.5) page lists BK beside anti-tank, dual-purpose, and smoke loads, while later Instalaza product lines keep a separate anti-bunker option for confined-space and reusable launcher families.

Family itemRelevant BK contextReader significance
C90-CR (M3.5)C90-CR-BK (M3.5) is the anti-bunker load in the disposable C90-CR table.This is the exact munition covered by this record.
CS90Instalaza lists the confined-space CS90 system with anti-tank, dual-purpose, and anti-bunker munitions.The BK role is retained for firing positions where backblast constraints matter.
C90 ReusableInstalaza describes a reusable tube for latest-generation C90 ammunition; EDR identifies a reusable-family CR-BK anti-bunker round.The anti-bunker mission is not limited to the disposable launcher branch.
Documented Specifications

Instalaza's M3.5 table makes the BK round the shortest-ranged combat load in the C90-CR set, but the one described for anti-bunker follow-through.

SpecValuePage context
Caliber90 mmCommon C90 family caliber.
Weight5.4 kgTransport configuration for the C90-CR-BK (M3.5).
Effective range300 mListed against area targets.
Penetration140 mm armour steel; 300 mm concreteConcrete penetration is the key anti-bunker figure; Instalaza also lists armor-steel penetration.
Interior effect> 400 fragments inside the bunkerInstalaza lists the fragment figure for the bunker interior effect.
Timeline

C90-CR-BK (M3.5) Key Events

  1. First-generation C90 enters service

    Instalaza's company history records operational evaluation and entry into service of the first-generation C90 weapon system.

  2. Anti-bunker C90 family variant enters service

    Instalaza records entry into service of an anti-bunker variant in the C90 weapon-system family.

  3. Fourth-generation C90 weapon system enters service

    Instalaza's history lists entry into service of a fourth-generation C90 weapon system, preceding the current M3.5 product presentation.

  4. Reusable C90 launcher family introduced

    Instalaza describes the C90 Reusable as a later ultralight reusable launcher tube able to fire current-generation C90 ammunition.

Media

C90-CR-BK (M3.5) Images

C90-CR-BK (M3.5), 90 mm anti-bunker munition, Munitions - view 1
Source: C90-CR (M3.5) Weapon System
Related Weapon Systems
C90-CR-AM (M3.5) dual-purpose munition, Dual-purpose anti-armour and fragmentation 90 mm munition, MunitionsMunitionsC90-CR-AM (M3.5) dual-purpose munitionDual-purpose anti-armour and fragmentation 90 mm munitionThe C90-CR-AM (M3.5) is Instalaza's Spanish dual-purpose 90 mm C90-CR variant, combining anti-armour penetration with a fragmentation effect in a disposable shoulder-launched weapon system. Instalaza lists it as the AM load in the C90-CR (M3.5) table, while open-source Ukraine reporting identified a C90-CR-AM M3.5 among newly supplied anti-tank weapons seen with Ukrainian Azov combatants in March 2022.
Instalaza C-90 / C90-CR, Disposable 90 mm shoulder-fired rocket launcher, Infantry WeaponsInfantry WeaponsInstalaza C-90 / C90-CRDisposable 90 mm shoulder-fired rocket launcherThe Instalaza C-90 / C90-CR is a Spanish disposable 90 mm shoulder-fired rocket launcher family built around single-use tubes, integrated 2x optics, and mission-specific anti-tank, dual-purpose, smoke, and anti-bunker munitions. Open-source conflict records tie the system to captured C-90 series launchers in Yemen and to Spain's 2022 military aid for Ukraine, where C90 launchers were documented in Ukrainian hands.
M79 Osa, Reusable 90 mm anti-tank rocket launcher, Infantry WeaponsInfantry WeaponsM79 OsaReusable 90 mm anti-tank rocket launcherThe M79 Osa is a Yugoslav-designed, reusable 90 mm shoulder-fired anti-tank rocket launcher built around unguided HEAT rockets, a detachable rocket container, and optical sighting. Direct conflict-use evidence includes Free Syrian Army firing in Damascus, Islamic State-associated M79 Osa rockets and launchers in Syria and Iraq, and a Somali security-force seizure in Puntland; source-backed family context also covers the RL90 M95, OSA 2, and thermobaric rocket payload.
MATADOR, Disposable shoulder-fired anti-armor recoilless weapon, Infantry WeaponsInfantry WeaponsMATADORDisposable shoulder-fired anti-armor recoilless weaponMATADOR, also marketed in the RGW 90 family, is a 90 mm disposable shoulder-fired recoilless weapon developed with Singaporean, German, and Israeli participation for anti-armor, breaching, and anti-structure missions. Singapore's version emphasized confined-space firing, a HEAT/HESH selectable effect, and wall-breaching performance for built-up areas, while Dynamit Nobel Defence's RGW 90 line includes dual-mode, anti-structure, long-range multipurpose, smoke, illumination, and training variants. The system is documented in Singapore service, in Israeli Matador WB use during the 2008 Gaza War, in German-funded RGW 90 deliveries to Ukraine, and in Israeli use during urban fighting in Gaza after October 2023.

Sources

C90-CR (M3.5) Weapon SystemPublisher: Instalaza S.A. | Note: Supports the C90-CR-BK (M3.5) designation, anti-bunker role, launcher compatibility, M3.5 family variants, transport weight, effective range, penetration, fragment figures, and official product imagery. | Accessed: 2026-06-29Instalaza Company HistoryPublisher: Instalaza S.A. | Note: Supports manufacturer background and C90-family timeline entries, including first-generation C90 service, the anti-bunker C90-family variant, fourth-generation C90 service, and C90 Reusable introduction. | Accessed: 2026-06-29CS90 Weapon SystemPublisher: Instalaza S.A. | Note: Supports family context for the confined-space C90 branch and its anti-bunker munition option. | Accessed: 2026-06-29C90 Reusable Weapon SystemPublisher: Instalaza S.A. | Note: Supports family context for the reusable C90 launcher branch and its compatibility with latest-generation C90 ammunition. | Accessed: 2026-06-29Instalaza Rocket Launchers EvolutionPublisher: EDR Magazine | Note: Supports independent background on C90 family evolution, including confined-space and reusable anti-bunker variants adjacent to the disposable C90-CR-BK. | Accessed: 2026-06-29Spanish C90-CR Rocket Launchers and Alhambra Hand Grenades in YemenPublisher: Armament Research Services | Note: Supports the page caveat that open conflict evidence identifies C90-CR series launchers in Yemen but does not identify this C90-CR-BK (M3.5) munition as a conflict-fielded load. | Accessed: 2026-06-29Spain Sends Grenade Launchers to UkrainePublisher: NDTV / Reuters | Note: Supports the page caveat that public Ukraine reporting identifies Spanish grenade-launcher transfers but not this exact C90-CR-BK (M3.5) munition load. | Accessed: 2026-06-29