HALIFAX, N.C. (AP) — With 165 grains of black powder in the barrel, a .75-caliber Brown Bess flintlock musket like the ones the redcoats carried in 1776 can hurl a lead ball at a velocity of around 1,000 feet (305 meters) per second. Imagine what that can do to a human body. Now, imagine that it’s almost completely exempt from gun regulations. How can that be? Well, under federal and most state laws, many antique or replica guns aren’t technically considered firearms. In most places, even