I have no idea. That's how the nh website has it. And the listing of lever action is just f***ed up. The way its written you can't even use a single shot break open rifle.....and there are plenty of single shot break opens out there in those calibers.What's with the arbitrary bolding? (I know you didn't do it, but you did post it...)
Heck, by strict definition, the lever gun has to be a shorter barrel. (Carbine vs. rifle)