Letters from Iwo Jima is the 2006 companion film to Flags of Our Fathers. Also directed by Clint Eastwood, this film depicts the battle of Iwo Jima from the perspective of the Japanese.
The following weapons were used in the movie Letters from Iwo Jima:
General Tadamichi Kuribayashi (Ken Watanabe) had an original Colt M1911 pistol offered by an American Officer when he was in the United States. By the end of the movie, he killed himself with this weapon. Then, a U.S. Marine found the pistol and took it. On a side note, the 1911 model in this movie had an ivory grip (possibly to differentiate it from the other 1911A1's with wooden grips that the Marines used).
Shimizu (Ryo Kase) and other Japanese soldiers are seen using the Type 94 pistol.
Type 98 Antiaircraft Gun
The Type 98 Antiaircraft Gun is used by a Japanese soldier to defend the island from an Air Raid.
United States Marine Corps Weapons
The following guns were used by the United States Marine Corps:
M1 Garand
Many Marines were equipped with this weapons (some of them were used with M1 bayonets). When Shimizu (Ryo Kase) surrender, a marine, using his M1 Garand rifle, executed him and an another Japanese POW. In the final scene, when Saigo (Kazunari Ninomiya) was surrounded by Marines, most of them used M1 Garand rifles.
M1 Carbine
In the last scene, the U.S. Marine lieutenant who took the M1911 pistol of General Kuribayashi (Ken Watanabe) had a M1 Carbine.
M1A1 Thompson
A U.S. Marine can be seen firing the M1A1 Thompson at fleeing Japanese soldiers.
Browning M1919A4
During the night assault led by the Navy Lieutenant Ito, American troops use Browning M1919A4 machine guns to counter the Japanese charge.
M2 Flamethrower
Sam (Lucas Elliott) had a M2 Flamethrower until he was captured. During the landing, two Japanese soldiers have been burnt by a M2 Flamethrower.
M1903 Springfield
Near the end of the movie, when Lieutenant Fujita was going to cut General Kuribayashi's (Ken Watanabe) head (Kuribayashi asked him to), he was suddenly shot. Then, far away, we see a Marine sniper operating a bolt. We cannot see the rifle, but it is pretty sure that it is a M1903A1 Springfield since it was the mainly used bolt action sniper rifle by the Marines (and other US forces) during World War II.
A source from ISS (which supplied the weapons for the film) has confirmed that the rifle was indeed an M1903A1 Springfield fitted with a 7.8x (8x) Unertl scope, and that the Marine sniper using the weapon was one of the film's technical advisors, Master Sergeant Tom Minder.