None. Regardless of what a company tells you about success percentage or how they have no issues with customs, the bottom line is that they are lying and only want your money and will tell you anything to get it.
As it stands attempting to order an airsoft gun from outside of Canada will result in a loss of money as Canada customs has does not allow the importation of airsoft guns. Its possible that you you may already be familiar with this.
There are Canadian based retailers that maybe able to supply what you are looking for.
That is all I can really say at this time.
"Its only a little bit on fire"