MAS-54 Rifle Series

Examples of various types of MAS-1954 (French: Fusil Automatique Manufacture d'Armes de Saint-Étienne 1954). These were prototype French battle rifles designed in 1954 and produced in very small numbers in prototype form only by the Manufacture d'armes de Saint-Étienne. One of a number of automatic weapon prototypes designed by MAS during the 1950s and 1960s, the MAS 54 was an unsuccessful attempt at replacing the MAS 49 in service.

The MAS 54 was made in three variants; a carbine, bullpup layout and full-length rifle. The weapon was never actually submitted to military trials. While the rifle's attempt at replacing the MAS 49 was without success, the work done on the MAS 54 eventually culminated in the design of the FA-MAS Type 62.

See: https://www.forgottenweapons.com/rifles/french-mas-type-62/

And: https://guns.fandom.com/wiki/FA-MAS_Type_62