I remember my brother taking me to gunshops in Leesburg and Front Royal about 6 years ago before he retired from the Pentagon. You might do a computer search for those shops to see if they survived. Quite a ways from Fort Belvoir, but a REALLY nice part of the world to drive in this time of year.

He also frequented a shop and range called Clark Brothers in the Virginia side of the DC area, which you might look up to see if they are still with us.