Ruger Sr 556 Rifles Semi Auto 3

About this product

The Ruger SR-556 is a gas-piston-operated, AR-platform rifle chambered in 5.56 NATO/.223 Remington, and this listing is priced at $1,995. Before anything else: Ruger discontinued the SR-556 line, replacing it first with the direct-impingement AR-556 and, more recently, with the new Harrier rifle — so this is a discontinued model, and we want you to know that going in rather than find out later. As a firearm, it ships to a licensed FFL dealer for pickup only.

What made the Ruger SR-556 different from a standard AR-15?

People searching ruger sr556 are usually familiar with the fact that most AR-15s, including Ruger's own AR-556, use direct gas impingement to cycle the action. The SR-556 instead used a short-stroke gas piston system with a rotating bolt, which keeps combustion gas out of the receiver — piston guns tend to run cleaner and cooler at the bolt carrier than direct-impingement rifles, at the cost of added weight and complexity. It is a meaningfully different rifle under the skin from the AR-556 that eventually replaced it.

What are the SR-556's specs?

The rifle weighs about 7.94 pounds unloaded, runs a 16.12-inch barrel, and has an overall length of 32.75 inches collapsed to 36 inches extended on its adjustable stock. Ruger rated the cyclic rate at roughly 800 rounds per minute in semi-auto and listed a muzzle velocity around 3,100 feet per second — solid numbers for a piston AR of its era. The $1,995 price reflects the rifle's original-era MSRP; because Ruger no longer manufactures it, condition and included accessories matter more than they would on a current-production rifle, so ask about exact condition before you buy.

Is a discontinued rifle like this still a good buy?

Piston-driven ARs like the SR-556 still have a following because of their cleaner operation, and discontinued status does not mean unreliable — it just means Ruger has moved on to newer product lines and parts support may lean more on the aftermarket than on Ruger directly going forward. If you are comparing it to a current-production AR-556 or Harrier, know you are buying into an older piston design rather than Ruger's current lineup.

What should I check before buying a discontinued rifle like this?

With any discontinued firearm, condition matters more than it would on a new-production gun, since there is no factory to send it back to for warranty work if something turns up wrong later. Ask about round count if it is known, look closely at the gas piston system and op-rod for wear, and confirm the bolt and barrel are original Ruger parts rather than swapped aftermarket pieces, since piston ARs have more moving parts in that area than a direct-impingement rifle and mismatched components can affect reliability. None of that means avoid it — it just means ask the questions you would ask about any used rifle before you commit.

It is also worth thinking about magazines and optics separately from the rifle itself: because the SR-556 has been out of production for years, you will likely be sourcing magazines and any replacement furniture from the broader AR-15 aftermarket rather than from Ruger directly, which is not a problem given how standardized AR magazines are, but is worth knowing going in.

Checkout runs through our secure checkout, and once your background check clears we will get the rifle to your chosen FFL for transfer. If you specifically want a piston AR rather than direct impingement, the SR-556 remains a solid representative of that design even though Ruger no longer builds it.