Canadian Government and Politics
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this is not the 1st reference I have seen regarding taking handguns into Canada. 4" or longer barrel is needed.
I've heard of a couple American's getting their handguns into Canada. But I've heard of alot more having them confiscated at the border. There may be some border guards who have a looser interpretation of the rules, but most of them will take your handguns. You'd probably be well advised to obtain an interpretation in writing from the Canadian side before you come across.