Depending on your age, you may or may not have been affected by the 1994 Assault Weapons Ban, the one that was allowed to expire in 2004. During the ban, sales of certain types of semi-automatic AR-15s and other scary-looking guns were limited to military and LE personnel. Even more restrictive, magazines were limited to a maximum of 10 rounds for just about any kind of weapon, pistol, rifle, whatever. Versions of this ban still exist in some states – notably California and Massachusetts – which still strictly regulate certain types of weapons and magazine sizes.