Batych,
I finally got a bill from UPS for $26.00 for Entry Fees and NAFTA Processing Fee for my swivel gun, the same as Lee1966 paid for his carriage. I think this is pretty much standard for anything shipped from Canadian Cannon Company.
The bill arrived the same day as the beer can mortar with sleigh carriage I ordered a couple of weeks ago from CCC, so I expect to get another $26.00 bill on that one. By the way, that mortar is one fine piece. It's probably lighter than most beer can mortars (20 lbs) and the powder subchamber holds a max charge of 250 grains of 1Fg. The bore is a fairly tight 2.64" and a full 5" deep, so the can fits all the way into the tube with nothing sticking out.