No, I'm not planning on getting a Toyota Hilux and making my own "Technical", but once the Porsche sells, I do plan on hunting down an old jeep and was wondering if I ever decided to mount either a semi auto or completely demilled Ma Duce or .30 machine gun on it if there would be any legal problems.

I figure you can't drive around with a loaded gun mounted on the Jeep, but what about an unloaded but functional gun? Or a non-functional dummy gun?

I couldn't find any Colorado laws in my brief bit of googling.