I can take an AR "pistol" to any state that allows them without any kind of notification, whatsoever, to anyone. If I want to take an SBR to any other state than it's registered to, I have to ask the BATFE for permission, and receive that permission back, before I can do it...
Pistol > SBR, as far as freedom goes.
Ron is all OVER this, and has done it for 3 years now, to bring his stash to the Fall Shoots... @Rsquared