Carrying a rifle does not constitute a provocation in itself. Rittenhouse, by all accounts, was not running around randomly pointing or shooting his rifle. Part of the evidence will be the video that shows someone shooting in Rittenhouse's direction and the rioters that were descending upon him. The capacity of the rifle (how many bullets the magazine held) may be a point of law but has little to do with the incident because Rittenhouse only fired a few shots in self defense. As I said, he may be guilty of carrying a gun because he was under 18 but that is a misdemeanor in Wisconsin. IF Wisconsin has a magazine limit and he exceeded that, he may also be guilty of that but those are minimal infractions and do not constitute murder.