Sturm Ruger & Co. knew back in 2009 that they needed to be in the semi-auto rifle market with more than just the Mini-14. They wanted an AR-15-type rifle, but soon discovered that the“Mil-Spec” AR-15 left a lot to be desired. A standard AR sends its hot gases back to the bolt, pushing on the bolt carrier and opening it for the next shot. This makes for a very hot and very dirty bolt group after only a few rounds, and this can and does hurt both short and long term reliability.
So while most of the market was busy copying the standard AR-15 design with their own branded product, Ruger decided to take the less beaten path, and create their own design. That design was the SR-556, in 5.56 NATO, or .223 Remington. Instead of just gas, the 556 employed a rod to move the bolt, this rod rode above the barrel, and was controlled by an adjustable gas block. The design is very similar to the rifle that used to be called “the right arm of the free world,” the FN-FAL. This new Ruger rifle contained the gas/rod system of the FAL, yet had the weight advantage and ergonomics of the AR-15. Out of the gate the SR-556 was a hit for Ruger, and several variations of the SR556 are still extremely popular today.
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