WASHINGTON - Lee Harvey Oswald assassinated President John F. Kennedy on Nov. 22, 1963, with a mail-order Mannlicher-Carcano 6.5 millimeter bolt-action rifle, for which he paid $19.95 plus shipping and handling. Fifty years later, obtaining guns via mail is less common because the U.S. Postal Service imposes major restrictions on firearms shipments. But despite a myriad of federal and state laws regulating gun transactions, buying a firearm via the Internet is... (GunPolicy.org)