Near the end of the movie, two hired goons from Defy Foods 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 Torokurō Amuzu's underground 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-Sauer P2288
Police Sergeant Rin Gaga carries a SIG-Sauer 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. Another Tokarev is seen in Amuzu's 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 Surefire 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 the monster 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.