A possible Colorado copycat, armed to the teeth and billing himself as “a joker,” was arrested Friday after threatening a mass shooting at his Maryland workplace, authorities said.

Neil Prescott, wearing a T-shirt declaring “Guns don’t kill people, I do,” was busted at his Maryland home — where cops found a lethal arsenal of 25 guns and thousands of rounds of ammunition…

Prescott, of Crofton, Md., made the threats Wednesday in two menacing phone calls to the Pitney Bowes offices in southern Maryland.

“I am a joker,” he reportedly declared. “I’m going to load my guns and blow everybody up.”

Prescott’s violent remarks came after he was fired by the mailroom and software supply company and just days after last Friday’s shootings in Aurora, Colo.

After his arrest, authorities recovered 25 weapons — including assault rifles and handguns — along with 40 boxes of ammunition stored in his home.

No charges were immediately filed in the case, and it was unclear how the suspect had assembled his arsenal…Prescott is undergoing a psychiatric evaluation at the Anne Arundel County Medical Center.

I don’t see anything in the photo that he couldn’t buy legally – today.