Gee wonder why?
Check it out:
For a brief time, concealed carry permit holders could exercise their Second Amendment rights by bringing their firearms into Washington D.C.; a right that was previously denied until the Palmer decision. Granted, if you were a D.C. resident, you had to have the gun registered. For outsiders, you couldn’t open carry your rifles or shotguns, and your handgun couldn’t have a magazine with more than ten-rounds.
Until recently, the District of Columbia was the last place where citizens were banned from carrying their firearms outside of their homes. A stay, which was agreed upon by both parties in the Palmer case, was issued to allow the city council to draft legislation in response to the ruling. But D.C. lawyers are trying to get the carrying ban reinstated.