Sturm Ruger KAC556F AC-556K .223REM 13″ bbl Factory 4-Position Select Fire Transferable Machine Gun


Status: In-Stock / Please Call to Purchase

This Chester County Armory listing is for a Sturm Ruger AC-556K .223REM transferable factory machine. This is a factory designated KAC556F model, indicating it is a stainless steel version in it’s original factory  13″ barrel short configuration with a factory Ruger right side folding stock.

One of the few factory-made 4-position (safe, semi-auto, three round burst, and full-auto) machine guns made in the US, the Sturm Ruger AC-556 is still one of the more desired full-auto weapons available at a relatively reasonable NFA price tag left on the US transferable market. Designed and built like all of Ruger’s weapons (robust, with exceptional functionality), Bill Ruger’s entry into Class 3 weapons with the AC-556 was no different.  Designed in 1979 and based off the semi-auto Mini-14 that he (along with Jim Sullivan) created 6 years earlier as a scaled down version of the venerable M14 rifle, Ruger developed a workhouse of a gun, utilizing new manufacturing and engineering techniques to build a robust weapon that would be affordable to produce without sacrificing durability in any way. This occurred namely with the creation of a strong, investment cast receiver that was heat treated to withstand even the harshest of punishment.

This factory-made and registered machine gun is in excellent overall condition. The internal mechanics and the interior metalwork are excellent, with no dings, dents, cracks,  malformations, etc.. The internals on this weapon note only minor finish wear on the metal-to-metal contact points of the bolt and charging handle assembly. The bolt face is clean and crisp. The barrel remains clean, bright, and shiny, with well-defined rifling.

Cosmetically, the receiver displays some minor surface handling marks, and there are some minor scratches of note on the original rear sight assembly, however nothing more than cosmetic in nature. The wooden stock displays some minor indentations and light surface marks , but no chips, cracks, etc.. The folding stock lock-up remains tight and solid. The handguard and barrel are in excellent cosmetic condition. Overall, this is an excellent investment model for the collector who also wishes to fire his machine guns.

This factory KAC556F transferable machine gun is currently on a Form 3 for easy eForm transfer. The current NFA paperwork lists “Sturm Ruger” as the manufacturer of this weapon and “KAC556F” as the model.

Add to wishlist

    This Chester County Armory listing is for a factory original Sturm Ruger AC-556K .223rem transferable machine gun. It is a factory KAC556F model, designating it as Stainless Steel version that features an original 13″ bbl and a factory folding stock.  This model is currently in-stock, in our possession,  and available for purchase on a Form 3. Please call us at 610-235-6155 to purchase or for additional information on this item


    Sturm Ruger





    Barrel Length



    Stainless Steel