This is a bizarre circumstance where Pennsylvania doesn’t honor my CCW permits, but Washington DC does all of a sudden. Wow.
Be aware that any firearm you carry into Washington DC has to comply with existing restrictions regarding magazine capacity limits and various approved model types, or whatever DC has codified into law. This is a panic move on the DC police’s part, but they will fiercely enforce the laws they do have.
Excellent points on the approved models and magazine limits that remain in place in DC, hope nobody on our side gets hung out to dry on those technicalities of DC law.