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Ruger AC-556


Select-Fire Automatic Rifle (1980)


Infantry Small Arms / The Warfighter

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Jump-to: Specifications

The select-fire Ruger AC-556 became a militarized version of the popular Ruger Mini-14 rifle, a design based on the Vietnam-era M14.



Authored By: Staff Writer | Last Edited: 09/27/2016 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.
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The Ruger AC-556 was a variant of the popular Ruger "Mini-14" series of semi-automatic carbine rifles introduced in 1973. The Mini-14 itself held origins in the equally-popular M14 gas-operated Battle Rifle of the United States military, this development made possible through a post-World War 2 initiative that sought to replace the war-winning M1 Garand service rifle. As such, the M14 was based on the M1 Garand with the Mini-14, in turn, based on the M14. This then paved the way for the Ruger concern to finalize a militarized form of their civilian-minded Mini-14 offering, the design eventually emerging as the "AC-556". The AC-556 was primarily intended for sale to military and police markets and found a home in a few such groups of the world. Production of the rifle (since discontinued) was handled in-house by Sturm, Ruger & Company, Incorporated of Southport, Connecticut, United States.

The AC-556 retained its gas-operated, semi-automatic features and was chambered for the 5.56x45mm cartridge firing from a 20-round curved detachable box magazine. The system was given a receiver-mounted firing selector which allowed for a conventional single-shot, repeat-fire, semi-automatic fire mode as well as a three-round burst facility and full-automatic fire. Provision was also made for a bayonet mounting at the front of the weapon (near the forward sight) and the barrel was cleared to fire non-lethal rifle grenades for riot control. A flash suppressor was added to the business end of the barrel while a perforated glass-fiber handguard protected the operator's support hand from the generated heat of the barrel during firing. The design was strengthened where possible for the rigors of military service while retaining many of the proven quality features of the Mini-14 before it - including its notable compact profile.

Original AC-556 production versions were marketed with fixed solid wooden stocks. The later AC-556F and AC-556K models brought about use of a folding stock which collapsed under the weapon for a shorter overall length. These latter versions were, therefore, forced to install a full pistol grip under the aft-end of the receiver in the usual way. A thirty-round capacity magazine appeared for AC-556s for a short time.

Specifications



Service Year
1980

Origin
United States national flag graphic
United States

Classification


Select-Fire Automatic Rifle


Sturm, Ruger & Company - USA
National flag of the United States United States
(OPERATORS list includes past, present, and future operators when applicable)
Automatic Function
Features a mechanical function to automate the firing action.


Overall Length
984 mm
38.74 in
Barrel Length
470 mm
18.50 in
Empty Wgt
6.37 lb
2.89 kg
Sights


Iron front and rear


Action


Gas-Operated, Rotating Bolt; Select-Fire

Rotating Bolt
System utilizes internal mechanism to lock the breech or rear barrel assembly prior to firing.
Gas-Operated
Gas-operated system is featured, typically involving a gas cylinder and rear-driven piston directing energy to the bolt component.
(Material presented above is for historical and entertainment value and should not be construed as usable for hardware restoration, maintenance, or general operation - always consult official manufacturer sources for such information)


Caliber(s)*


5.56x45mm

Sample Visuals**


Graphical image of a 5.56mm intermediate rifle cartridge
Rounds / Feed


20- or 30-Round Detachable Box Magazine
Cartridge relative size chart
*May not represent an exhuastive list; calibers are model-specific dependent, always consult official manufacturer sources.
**Graphics not to actual size; not all cartridges may be represented visually; graphics intended for general reference only.
Max Eff.Range
656 ft
(200 m | 219 yd)
Rate-of-Fire
750
rds/min
Muzzle Velocity
3,400 ft/sec
(1,036 m/sec)


AC-556 - Initial Production Model Designation; solid wood stock.
AC-556F - Folding Stock; pistol grip
AC-556K - Folding Stock; pistol grip


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