Near the end of the movie, two hired goons attempt to kill Monaka with their Glock 17s. Monaka quickly shoots them both in the head before they can get a clean shot at her.
Heckler & Koch Mark 23
A Heckler & Koch Mark 23 is seen with a student during a classroom inspection when a teacher confiscates the gas gun.
Makarov PM
In the opening scenes of the movie, Tsuin draws a Makarov PM and opens fire at the pursing police officers. Another Makarov is seen in Monaka's boss' armory, when Monaka is selecting her firearms for a job.
"Red Club"
Monaka uses a fictional handgun that can use conventional and explosives rounds as her personal sidearm. Amuzu called it "The Red Club" and states it was used by a young female assassin like her. Obviously referring to Sawa from Kite.
SIG P228
Police Sergeant Rin Gaga carries a SIG P228 as his sidearm.
Tokarev TT-33 Pistol
Tsuin's older brother attacks Police Sergeant Rin Gaga, the cop he thinks killed his little brother, with a Tokarev TT-33 Pistol. Another Tokarev is seen in Monaka's boss' armory, when Monaka is selecting her firearms for a job.
Revolvers
Smith & Wesson Model 29
A Smith & Wesson Model 29 is seen with a student during a classroom inspection when a teacher confiscates the gas gun.
Armed ISS officers aboard the International Space Station are carrying Heckler & Koch MP5A4s with mounted flashlights, which they fire on full auto. It seems a bit odd and dangerous to be bringing fully automatic sub-machine guns aboard a multi-billion dollar space station.
Steyr TMP
After firing all rounds in the Steyr Scout, Monaka goes for a full-out assault with a Steyr TMP.
Sniper Rifles
Steyr Scout
Monaka attacks her mutated father with a Steyr Scout. She fires five times in quick succession, but the rounds do almost no visible damage. Note a traditional scope is mounted rather than a long eye relief scope, which the rifle is designed for.