There is some sentiment that the reason the press keeps repeating the "across state lines" point is because the intention is to use this for federal regulations on gun control. It's important for them to make this an interstate crime to make their case. Except this falls apart, as the Prosecutor discovered, because Rittenhouse's Dad lives in Kenosha.
With regards to length of rifle barrel, there was a similar law in Texas. Anything longer than a 5.5 inch blade is illegal to carry. Deer hunting is popular in Wisconsin. It makes sense to craft the law to allow for young hunters to carry a rifle. However, you don't want them to have short-barreled rifles, like a sawed-off shotgun or pistol. Therefore, a legal definition is required to distinguish what barrel length is acceptable. And, there is little difference, other than cosmetics, between a hunting AR-15 and one that looks like an "assault rifle". This means that the only meaningful distinction is the barrel length. From a practical standpoint, a longer barrel is also better for aiming than is a shorter barrel, except for John Wicke.
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