Marine vet prosecutor refuses to cross constitutional line on Spanberger ‘assault weapon' ban; Mehaffey sent a letter to Spotsylvania Sheriff Roger Harris, instructing him that the ban is "unconstitutional and cannot be lawfully enforced."; Today, the basic infantry weapon in the U.S. military is the M4A1 carbine equipped with a 30-round magazine. Mehaffey argues that in Virginia, historical tradition and case law precedent not only allow citizens to own firearms but even require them to arm themselves with the weapons of a basic infantryman for common defense. In the Founding Fathers’ time, Mehaffey said the standard issue was a musket and 20 rounds. Today, the basic infantry weapon in the U.S. military is the M4A1 carbine equipped with a 30-round magazine.