Peace Token (Robert) will have magazines, watch his prices though. Keep cruising on down to Jaxons, in Parksley, about 14 more miles south. I used to work there. Tell Harris "OMCHamlin" sent you, he should take good care of you on some magazines I would think.I went to a store in Delaware last weekend looking for AR mags and apparently they can't sell them even to Marylanders. I live on the eastern shore and they referred me to Peace Token on rt 13 in Virginia.
From Belcamp, you'll probably have to go to PA.
The spot has a a nice sign and you can get a bite to eat while you are "fixing" your mag. Oh and pick up your permit at the nearest Sherifs office. Win, win.But then you still need to drive across the border to the designated mag modification spot in the McDonald's parking lot.