What you mean is....if you live close to a another states border..and you go to a town in that other state...you cannot purchase a pistol and take possession of it right then.
You can still buy one..but it needs to be shipped FFL to FFL..........
C&R rifles (Federal Firearms License Type 03). . . not criminals’ weapons of choice.
https://www.samcoglobal.com/rifles-2010.html
***You can still buy one..but it needs to be shipped FFL to FFL.......... ****
For a handgun, you can’t walk into a store across state lines, lay down your money, fill out the fed form and walk out with it.
You can with a rifle or shotgun.