Carry, Carry: Not Contrary.

Constitutional carry has no effect on the preexisting background-check rules: The federal system exists independently of state law, and states that abolish their carry permits are not obliged to alter their background-check rules in concert. Since 2003, 24 states have joined Vermont, bringing the total number of states in which law-abiding citizens may carry concealed firearms without first having to apply for a permit to 25 - or exactly half of the 50 that have been admitted to the Union thus far. Likewise if the case had come down in 1996, by which point 30 states had adopted "shall issue" but there were still twelve "may issue" states and seven "no issue" states in existence. [Extracted from the article]