Once you've watched a few, it becomes pretty boring. It's always the same. Someone comes in and wants a gun made, the owner flies off in a helicopter to do a big deal with a gun collector millionaire, the employees or family members bicker amongst themselves and it ends with some customer shooting at a target of some sort that miraculously explodes.
I see it's been cancelled by the Discovery Channel and they're not even going to show repeats, following the Sandy Hook School shooting. Which is a shame I suppose as it's harmless really.