The use of antiques in combat is something that often is overlooked, as many find greater interest in more modern weapons. However, though these older weapons are as obsolete as they are antique, they are still relevant articles of war, and still certainly lethal. Silent YouTuber jmantime covers the use of some World War II weapons in the ongoing Syrian Civil War:

Each weapon is vignetted with a representative still image, followed by still photos and video footage of the actual weapon(s) in question being used in the conflict. Notable weapons include a chromed or nickeled Beretta 38 submachine gun, a cache of MAS 36 rifles, what appears to be a rearsenaled or civilian production M1 Garand, a PTRS-41 14.5x114mm anti-materiel rifle, and of course several of the StG-44s captured from a Syrian government stockpile by rebel fighters.