I'd recommend W.H.B. Smith's "Small Arms of the World" in any edition. The latest, the 12th, went out of print about two years ago but you can still find used copies floating around.
Lemme see, you should have a MK IV Enfield in .303, a Moisin Nagant, a Mauser 98k, a 1903A3 Springfield, a M1 Garand, a M1 Carbine, a Mas 36, aw nuts. Get the book and be sure you have a large enough safe.