Marketed to law enforcement and foreign military clients, the AC-556 family of weapons is the Mini-14 223 caliber rifle configured as a factory original selective fire machine gun. Fixed blade front and adjustable peep rear sights, with no muzzle device, threading or bayonet lug on the barrel. The hold-open device is externally mounted, with a manual control lever, the safety is fit to the front of the triggerguard, and a low profile checkered selector switch is present on the right side of the receiver heel, with functional semi-automatic, 3-round burst, and full-automatic settings. A number "6" label has been applied to the trigger guard, possibly a police department rack number. Smooth hardwood stock, with hardwood upper handguard, smooth wrist, smooth alloy buttplate and a brown leather sling.