I recorded this of a friend shooting my gun. It's the MAS-38. Pre-war design chambered in 7.65 Longue. Pretty much 100% milled gun, very much the opposite of the Sten. Bolt approaches the chamber at an angle. Weird but cool gun. Only downer is you have to reload for it.
The MAT-49 came after the war and to my understanding was only chambered in 9mm, and was mostly a stamped gun.
K MAS 38 - YouTube