Folks, I'm taking on a contract position in Pennsylvania as of this coming week and need a quick overview of firearms laws. I've got a North Carolina Concealed Handgun permit, so I can legally carry in Pennsylvania (or so it seems from a cursory websearch). What about AR-15 style weapons? Any problem there? The thought of carrying firearms, even unloaded and in locked containers through Maryland and especially DC, scares the you-know out of me.