Probably the Springfield 1903A3 that started production in 1942, there were alot of '03 used in WWII. The Army adopted the Garand in 1936 but still used hundreds of thousands of 03s in WWII, and the Marines didn't adopted the Garand till 1941, when they fought on Guadalcanal most still had Springfields. They didn't start changing over from Springfields to Garands till early 1943.