District of Columbia's Permit to Purchase
All firearms must be registered. The registration process is also a permitting process, and is very complex.
What is Permit to Purchase?
Some states require that a citizen acquires a permit, before they purchase a gun. If it is required, there will be a fee that varies from state to state. Some states also require finger printing, and background checks before issuing the permit.
Other District of Columbia firearm laws
Compare Permit to Purchase Nationwide