I thought guns were illegal in DC? /s
Actually they aren’t. In fact, DC is shall issue on CCW permits ever since 2014 and Wrenn v. District of Columbia.
They make you jump through some hoops, but in the end, they have to give you a CCW permit:
https://mpdc.dc.gov/page/applying-license-carry-handgun
You don’t have to be a resident to get one either.
Including you have to have registered ammunition.
“I thought guns were illegal in DC? /s”
They most certainly are illegal......for law abiding citizens.