It used to be a federal crime (1968 GCL)to buy any gun in one state if you live in another. Now you can buy a rifle or shotgun in one state if you live in another provided the state you live in allows such firearms.
It is still illegal to buy Handguns in one state if you live in a different state.
“It is still illegal to buy Handguns in one state if you live in a different state.”
Except for Dallas, Texas, where a federal judge ruled that part of the Gun Control Act of 1968 to be unconstitutional.
http://gunwatch.blogspot.com/2015/02/federal-ban-on-interstate-sale-of.html
If you buy from a Federally Licensed Firearms dealer he can ship it to a similarly licensed dealer in your home state for a small S&H fee.
Regards,
GtG