Bringing a gun, staying out of trouble in Canada

Fish 'n ' Grits wrote:
Make sure you obtain and fill out the US Customs form (I don't remember the number) that proves you took the firearm OUT of the US, otherwise you might have a problem when you return. I think you're really supposed to have that form with any item over a certain value (camera gear, etc.) but my shotgun was the only thing I was asked about.