They called 'em Space Guns!

[Eric300]

What is the name of that cartoon character? I recognize it but he seemed to be short lived, not in many cartoons.

Marvin the Martian. He had a side-kick dog named 'K-9'. His goal was to destroy the earth.

 

[Dan Carey]

You oughta get an XP-100, just to pull out after the High
Standards...

And what makes you think I don't? .221 Fireball