The FMK-3 is chambered in 9 mm, with a rate of fire of 650 rounds per minute. 20, 32, and 40 round magazines are available for the FMK-3 as well as the adaption of a silencer and grenade firing capability.
The FMK-3 is comparable, to the Heckler & Koch MP-5 in ergonomics (IE: selector switch, position of cocking handle, stock section) although it uses a grip inserted magazine, and performance (IE: firing from closed bolt, well balanced).
FMK-3
Main variant, The FMK-3 has a retractable wire stock. Fixed stocks have been recently made that can be installed by two prongs. FMK-3s have also been adapted with picatinny rails.
FMK-4
Rarely, variants are found with fixed polymer stocks, similar to that found on the H&K G3.
FMK-5
The FMK-3 is also produced for the civilian market, in semi-automatic-only version as the FMK-5.
| FMK-3 | |
|---|---|
| Type | Submachine gun |
| Place of origin |  Argentina |
| Service history | |
| In service | 1974-present |
| Used by | Argentina |
| Wars | Falklands War |
| Production history | |
| Manufacturer | Fabricaciones Militares |
| Produced | 1974 |
| Number built | 30,000 |
| Variants | See Variants |
| Specifications | |
| Weight | 3.4 kg (7.5 lb) empty |
| Length | 523 mm (20.6 in), stock folded 693 mm (27.3 in), stock extended |
| Barrel length | 290 mm (11.4 in) |
| | |
| Cartridge | 9x19mm Parabellum |
| Action | Blowback, open bolt |
| Rate of fire | 650 rounds/min |
| Effective range | 100 m |
| Feed system | 25, 32, and 40-round detachable box magazine |
| Sights | Flip up iron sights |
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