The Painless Gun (無痛銃, Mutsū Jū) is a large gun capable of piercing even armored vehicles.
It has a canon-like appearance. It has 7.62-millimeter ammo for piercing hard armor. With the velocity from the muzzle being 2700 kilometers per hour, it is capable of piercing armored vehicles. 
- Bungo Stray Dogs Manga: Chapter 75.
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