Devilman is a manga series written and illustrated by Go Nagai. There are anime TV-series three OVA movies, based on this manga, released. This page about OVAs.
Devilman: The Birth
The following weapons were used in the film Devilman: The Birth:
Over-Under Shotgun (Short-Barreled)
Ryou Asuka owns Short-Barreled Over-Under Shotgun. Akira Fudou fires it at the one moment.
Devilman: Demon Bird Sirène
The following weapons were used in the film Devilman: Demon Bird Sirène:
Winchester Model 70
Ryou Asuka fires Winchester Model 70 one time.
M16 Style Rifle
M16 Style Rifle can be seen in the hands of military robots.
Browning M2 Heavy Barrel
Browning M2 Heavy Barrel can be seen mounted on the tank.
Amon: The Darkside of The Devilman
The following weapons were used in the film Amon: The Darkside of The Devilman:
Howa Type 89
JSDF member fires Howa Type 89 at the one moment.
Bolt Action Rifle
An unknown bolt action rifle can be seen in the hands of one of the vigilantes.