Assault rifles are completely illegal in Washington, but that didn’t stop the accidental delivery. Transporting a weapon into DC is also completely illegal. Apparently, the third party Amazon seller who shipped out the 37-inch, 7.62 X 51 mm NATO caliber rifle intended it to hit a gun dealer in Pennsylvania. Not some guy in DC.
More:
http://gizmodo.com/5933021/guy-gets-giant-assault-rifle-from-amazon-instead-of-tv