30 odd 6 .3006 of an inch same difference
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The US .
M1 grand m9 bazooka m12 flamethrower thompson bar trench gun
America used the M1 Carbine, M1 Garand, M1A1 Thompson, M3 "Grease Gun", Browning Automatic Rifle (B.A.R.), M1903 Springfield, M1917 Enfield, M1897 Trench Gun, M1917 Browning .30 Cal. LMG, Browning .50 Cal HMG, M1911 Colt .45, and the Bazooka (M1A1) and Variants.
It depends somewhat on your definition of "new", but basic infantry weaponry in World War II for the United States Army used only two weapons from Wordl War I in the regular footsoldiers equipment: The M1911A1 Colt automatic pistol, and the Browning Automatic Rifle (BAR). The 1903, and 03A3 Springfields of World War I were also used, but as sniper weapons, not as main infantry shoulder rifles. The basic shoulder rifle was the M1 Garand (1936), the secondary support shoulder weapon was the M1 Carbine, the submachine guns were the Thompson submachinegun, which missed, literally by days, being used in World War 1, and the M3 "grease gun" submachine gun. The bazooka was also a new weapon in WW II.
The M1 Garand is a semi-automatic rifle. It was designed in 1928 and produced from 1936 to 1957. It was the first standard-issue semi-automatic rifle. It was used in wars such as World War II, Korean War and Vietnam War.