The United States has laws that limit magazine size, too. Why are people still selling high-capacity magazines in the U.S.?
American laws on magazine capacity have been implemented differently than ours. In the U.S., both handguns and rifles have been limited to ten rounds. Their magazine limits apply to rimfire and manually-operated rifles as well (ours do not). But the major difference is that their laws only affect magazines manufactured after the date of the ban. “Pre-ban” magazines can retain their original capacity.
