The following weapons were used in the film Gyo:
PS Many screenshots are fractalized, it's artist's attempt to show an air pollution.
12 Gauge Over/Under Shotgun
One huntsman fires 12 Gauge Over/Under Shotgun at mutants.
Winchester Model 70
Another huntsman fires Winchester Model 70 at the same scene.
Howa Type 89
Several JSDF members can be seen armed with the Howa Type 89 rifles.