The 105 mm M1974 FMK-1 is the later standard in Argentina's Czekalski recoilless-rifle family, a heavy smoothbore infantry-support weapon with optical sights, an FAP/FN FAL spotting rifle, and a two-wheel adjustable carriage. Falklands War evidence directly documents the closely related Modelo 1968 Czekalski in Argentine service, while the M1974 designation is best supported as the improved FMK-1 ammunition and export-era standard.
Argentine forces used the 105 mm Modelo 1968 recoilless rifle around Mount Longdon and other outer Stanley positions during the Falklands War; the M1974 FMK-1 is the later model in the same Argentine 105 mm recoilless-rifle family rather than a separately confirmed Falklands variant.
The strongest open conflict evidence identifies the Modelo 1968 Czekalski in Falklands War service, while separate references describe the Modelo 1974 FMK-1 as the later improved ammunition or update standard. That source split makes the M1974 best read as part of the same Argentine 105 mm Czekalski family rather than as a separately confirmed Falklands variant.
Modelo 1968 Czekalski around Mount Longdon and other Stanley-area positions in 1982.
Modelo 1974 FMK-1, associated with the heavier FMK-1 HEAT projectile and possible sighting or ammunition-standard changes.
A 1981 Argentine decree authorized 72 FM K-1-A Czekalski recoilless rifles for Bolivia, and specialist sources list Guatemala among M1974 users, but available public sources support those as operator or export facts rather than direct conflict-use rows.
Sources: 105mm M1974; Infantry Support and Anti-tank Weapons in Latin America; Czekalski Archaeology in the Falklands; Decreto S 478/1981.
Public sources treat the M1974 FMK-1 as the later model in the same 105 mm Argentine recoilless-rifle family that began with the Modelo 1968; open references do not clearly separate structural changes from sighting and ammunition updates.
| Variant | Configuration | Designation notes |
|---|---|---|
| Modelo 1968 | Original Argentine 105 mm recoilless-rifle model | The original model fired ballistically matched HEAT and high-explosive rounds and is the variant directly documented in Argentine Falklands War use. Sources: 105mm M1974, Infantry Support and Anti-tank Weapons in Latin America |
| Modelo 1974 FMK-1 | Updated model / ammunition standard | The M1974 FMK-1 introduced an improved 14.7 kg HEAT round and retained the two-wheel carriage, optical sighting, and crew-served recoilless-rifle layout; sources reviewed here leave the extent of structural change unclear. Sources: 105mm M1974, Infantry Support and Anti-tank Weapons in Latin America |
The Czekalski used a rifle-caliber spotting weapon to help the crew range targets before firing the recoilless-rifle round.
| Compatible item | Item type | Compatibility evidence |
|---|---|---|
 | FAP spotting rifle | Specialist references describe a 7.62 mm FAP/FN FAL spotting rifle fitted to the M1968/M1974 family, firing tracer rounds that burst on impact for target confirmation. Sources: 105mm M1974, Infantry Support and Anti-tank Weapons in Latin America |
The Anuario de Arqueología article ties the Czekalski family to Argentine design and production from 1968 and uses the weapon as a case study for Falklands battlefield archaeology.
Sources: Czekalski Archaeology in the Falklands
WeaponSystems.net dates family service entry to 1968 and identifies Argentina as the origin.
Sources: 105mm M1974
Specialist references identify the Modelo 1974 FMK-1 as the updated production model associated with the improved FMK-1 HEAT shell.
Sources: 105mm M1974, Infantry Support and Anti-tank Weapons in Latin America
Small Arms Defense Journal and the Anuario de Arqueología article document Czekalski/Modelo 1968 use and battlefield material evidence in the Falklands War.
Sources: Infantry Support and Anti-tank Weapons in Latin America, Czekalski Archaeology in the Falklands
Argentina's published secret-decree supplement records a 1981 authorization to export 72 105 mm L/28.5 FM K-1-A Czekalski recoilless rifles and associated ammunition to Bolivia.
Sources: Decreto S 478/1981
