It's a rough economy out there and everybody is looking for a way to make a buck and make ends meet.
Sounds like a guy who took a $49.95 mail in a coupon from the back of a gun rag course to be a gunsmith and found it was a little more complicated than he first thought.
Entrepreneurship gone wrong.
Unless you're a mechanical prodigy which apparently John isn't gunsmithing is a skillset that takes years to build.
I'd write it off to experience.
Hiring a lawyer for a civil suit would be throwing good money after bad and unless it's rape, armed robbery or murder it's hard to get the cops to spend any kinda time on penny ante rip off artists.
The cops are just too strapped for investigators, resources and time.
He probably hasn't got a pot to pizz in.
Can't squeeze blood out of a stone.