The US .
M1 grand m9 bazooka m12 flamethrower thompson bar trench gun
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.
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.
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.
M1 grand, Thompson sub machine gun, m1 carbine, 1911 pistol.
The Karabiner 98K was the standard issued rifle of Nazi Germany.
M1 Garand, M1A1 Thompson, Colt. .45, Browning Automatic Rifle (BAR), Grease Gun, K-Bar Bayonet Knife, M1 Carbine, 30 Cal. Light, 50 Cal.
The main infantry weapons used by US Forces were :- Colt M1911 pistol M1 Garand Rifle M1 Carbine M1903 Springfield Rifle M1 Thompson Sub-machine gun M3 Grease gun M1918 Browning Auto Rifle M1917 medium Machine gun M1919 Machine gun M2 .50 cal Heavy Machine gun
The M1 Garand rifle, Oerlikon 20mm naval cannon, Browning .303 aircraft machine gun.
The US .
Allies: M1 Garand, Thompson sub machine gun Axis: Kar 98K, Mp40
M1 Garands with Bayonets were mainly used to take Japanese positions in the Pacific during World War II
the best weapons used in WWII are, in my opinion, the; Russian Mosin-Nagant rifle US Thompson M1 submachine gun German Mauser Kar98k rifle German MP40 submachine gun
Both sides had excellent guns and rifles. For the Allies it was considered to be the M1 Grand, for the Germans it was the Mauser.
The marines used many gun models throughout the war. However, the primary weapon of US forces was the M-1 Garand. The M1 Carbine and M14 were also frequently used rifles.
the M1 garand rifle.