Since it's now too late and since I also live in The Formerly Free State, also known as The People's Republic of Maryland, here's my take. Maryland so far follows the Feds in not classifying C&B and BP as firearms (with the exception of one looney Delegate from Germantown), so you're clear there. HOWEVER, there are a bunch of prohibitions (Local ordinances, DNR regs, etc.) against shooting/ shooting off fireworks of almost any kind within 500 ft. of a house, or anywhere else for that matter. Since it's independence Day, however, popping a cap or six shouldn't be a problem if you're discreet.
If you live in PG County or Baltimore City your pops will be lost in the ambient background gunfire. But do not under any circumstances let the Crazy Cat Lady Down the Street see you, or she WILL tell the cops that you're BRANDISHING...
If you live in PG County or Baltimore City your pops will be lost in the ambient background gunfire. But do not under any circumstances let the Crazy Cat Lady Down the Street see you, or she WILL tell the cops that you're BRANDISHING...