From my personal collection is a mint Ruger AC-556. The Ruger factory letter states that this AC556 was manufactured in February 1984. The AC-556 is transferable under NFA guidelines as a machine gun. The AC-556 is capable of firing in the semi-automatic, three-round burst, or fully automatic mode. This one has the short 10" barrel, a factory folding stock, and is in new condition. Most people will never see a Ruger AC-556 much less own one so I have included some web information.
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. Fitted with a birdcage flash hider, blade and adjustable peep sights, and standard receiver markings. The selector switch is positioned on the right rear of the receiver, with positions for semi-automatic, three-round burst, and fully automatic. Smooth hardwood stock, with vented synthetic upper cover, checkered pistol grip, and folding metal buttstock.
Excellent with minimal handling marks blue finish, Stock, and grip is also excellent. Mechanically excellent.
NOTE: This weapon is a National Firearms Act (NFA), fully transferable rifle, which is registered with the Bureau of Alcohol, Tobacco, Firearms, and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 478. It will be transferred on form 4 to your FFL/SOT dealer for delivery to you. This type of transfer usually takes 60 days or less according to the ATF. When your NFA FFL receives the rifle you as the buyer are required to submit a form 4 to the ATF for a background check and the processing of this NFA rifle to you. This process can be lengthy and may take several months before you will receive your form 4 letter entitling you to take possession of your machine gun.
Who hasn’t looked at a Mini-14 or Mini-30 rifle and thought, man this baby would be a blast on full-auto? Well, it would seem great minds think alike because Sturm Ruger did just that back in the 1990's when they made a little-known variant built around this concept. The gun was the Ruger AC556, and it’s what is lovingly referred to in the full auto circles as a “buzz saw”.
Ruger started work on the variant in 1978, specifically targeting government sales. In the back of his mind, Bill Ruger had always believed the Mini-14 could have competed as a valid military rifle (a sentiment shared by Colonel Jeff Cooper) if it just had the right features. Taking the standard Mini-14 layout as an example, with its CNC-made chrome-molybdenum steel barrel and breech and extensive use of music-wire coil springs, Ruger made a few changes.
First, the AC556 has a completely different receiver, not to mention the fire control group. The receivers had to be slightly longer to fit the select-fire mode switch at its rear part. This selector moves from regular semi-auto fire to 3-round burst, to full auto with a flick of the dial. It was located to the right-hand side of the rear sight, with all the way back being rock and roll. The gun still maintained its standard Mini-14/30 safety lever in the trigger guard. The fixed-piston gas system was beefed up a little, as it, in its time, was one of the few select-fire 5.56mm ‘rod’ guns on the market. The end of the barrel held a NATO standard flash hider that doubled as a grenade launcher for rifle grenades and recoil damper.
The gun was produced in two flavors for commandos looking for different things. The first gun, the standard AC-556, has a 7.3-pound empty weight (7.8 loaded with a 20-round mag) and was 38.75-inches overall with an 18.5-inch barrel.
The second was the AC-556K, a chopped-down version. Slightly heavier at 7.9-pounds loaded, it was much shorter at just 33.5-inches with its folding stock open, and right at 24 with it folded neatly out of the way. The fact that it had a 10-inch barrel helped a lot. These have also been referred to in some publications as AC-556F models (for folder). (THIS RIFLE)
Both guns had 1:10 rifling with six grooves and could fire at 700 rounds per minute. This meant you could empty a 30-round mag in the time it took to say, “That’s pretty doggone fast.”