Caliber: 5.56 NATO. Copy of the gas-operated semi-automatic M16A1 with a 20” barrel. Harrington & Richardson was one of only four manufacturers to have made an official M16 variant for the U.S. military. Fixed synthetic stock, A2 carry handle receiver, smooth rifle-length handguard, A2 front sight. Includes sling swivels, 20-round magazine. SEE POLITICAL PANIC PRICING.