The impact of the UN arms trade treaty will be felt by local small business sporting goods shops and the millions of law abiding sport shooting Canadians.

It essentially involves expensive and onerous requirements to mark rifles and other small arms with markings identifying country of origin (which they already do, just not in the UN format), and what's refereed to as a back-door gun registry (which Canada recently rid itself of). 

There are several other levels of bureaucratic and onerous paperwork, but what it will most certainly NOT do, is keep guns out of the hands of criminals.