The following weapons were used in the film Akira:
Colonel Shikishima used a Desert Eagle to shoot Tetsuo at the Neo-Tokyo Stadium.
One of the resistance members while kidnapping Takashi uses a Beretta M1934 and Mayor Nesu also appears to uses one with a squared/hooked trigger guard.
Kei uses a Mauser HSc to shoot a soldier.
These Micro Uzi looking pistols are used by the military.
Star Model 316
When Shikishima is about to get arrested a man holds a Star Model 316 on him.
Guards holding unknown silenced SMGs on Shikishima.
Sten Mk. II
During the bombing of the skyscraper mall, one of the fleeing resistance members fires a Sten Mk. II submachine gun at pursuing soldiers before being gunned down.
One of the resistance members carries a full-size Uzi during the infiltration of the government labs. Kei later uses it to shoot at the flying platforms.
A three-barrel .50 caliber GAU-19/A is mounted on the flying platform.
Other than the flying platforms the military use tanks to stop Tetsuo with no avail.
Unknown Grenade Launcher
The Neo-Tokyo Army used Unknown Single-shot Grenade Launchers when trying to stop Tetsuo during his break-out.
Particle-acceleration cannons called "ARASAKA HLR-12X" are used by the army and Kaneda in the final battle against Tetsuo.