The 2nd Amendment issue in the United States is something I don't expect a non-American to understand. The rest of the world tends to take the process of enumerating freedoms positively. The law says you have it or don't.
In the U.S. the culture was framed around the preservation of liberty and the enumeration of the boundaries, and limitations on the ability of government and regulation to encroach. The problem with that is it opens a can of worms constitutionally that increasingly have led to the torture of common language in order to attempt to change the meaning of already passed laws instead of passing new ones which seem to be growing increasingly difficult to do.
Further, you have an entire caste of people specifically trained to use language in unintuitive ways.
As far as "Assault rifles" go, most people can't even define what one is. The fact is, an AR-15 that has the "look-and-feel" of a military patterned rifle is functionally equivalent to more "traditional looking" stock rifles like a Mini-14.
They are the same fundamental device. Neither one is more or less capable of killing someone. To anyone with experience with firearms, the "common sense" espoused by gun control people amounts to hysterics. All it is is a bunch of people tryimg to legislate everyone else's rights without demonstrating any understanding of the subject matter at hand other than being a special interest mouthpiece.
But it's because of this misalignment across a variety of issues that it’s difficult to have a straight discussion of cross-border political alignments— you need to have at least some semblance of a picture of how the Canadian left and right differs from the US left and right. (Another key one, for example, is that the Liberals in Canada officially strive to be a centrist party; the "real" Canadian left is the NDP and Green party, neither of which have ever held power at the federal level, though the NDP have come close a few times.)
You could easily argue that the "Conservative" party in Canada is equivalent or possibly even to the left of the mainstream Democratic party in the US. So yeah, it gets a bit weird when right-leaning people in Canada then also support Trumpian politics— sometimes it's hard to know if they're there after a considered review of the positions, or if it's just a knee jerk "pick the guy on the right" response.