The MAS-36 is French rifle featured in Medal of Honor: Underground and Infiltrator. Adopted in 1936 by the French Armed Forces the MAS-36 was used extensively in World War 2 by Vichy French Forces, French Armed Forces and the French Foreign Legion. Even after World War 2 the rifle saw use in many conflicts like the First Indochina War.
In the first mission Occupied!, Vichy French Milice units use rifles which cleary have a different sound effect than the Karabiner 98k. Although the rifles use the same skin as the Karabiner 98k, it is quite possible that they are supposed to be French MAS-36 rifles, which is what Vichy French forces would have used during the occupation of France. The player cannot use it in game.