Arasaka HJSH-18 Masamune

The Arasaka HJSH-18 Masamune is a Power Weapon that can be acquired in 2077.

Behind the scenes
"The flagship power weapon from the world's leading weapons manufacturer, the Masamune's the highest quality rifle in the game. Remarkably easy to conceal for a weapon of its size. Like many other guns, it is equipped with the magrail system for adding scopes, silencers, and other forms of user customization."

- Cyberpunk 2077 Artbook