A very small quantity (less than 250) of Mas 49-56 were built (new, not converted) in the early 1970s with the barrel chambered for the 7,62 NATO cartridge, these are easy to recognise:
- the firing pin is spring loaded like the Mas 44.
- the caliber marked on the receiver left side is: "CAL. 7,62 N"
- the three digit serial number is marked horizontally below the caliber and has no prefix letter.
Only a handfull of these has been sold by the Army.