RUGER SR556 for Sale
Browse ruger sr556 listings from verified sellers across the U.S. on GunsAmerica.
Quick Look
The Ruger SR-556 was Ruger's first foray into the AR-15 market, debuting in 2009. It utilized a patented short-stroke piston system to boost reliability over traditional direct impingement ARs. Though discontinued, it remains a robust and respected choice among piston-driven rifles.
Why It's a Top Choice
- Chrome-lined, cold hammer-forged barrel for longevity
- Adjustable four-position gas regulator
- Piston-driven system reduces fouling
- Equipped with flip-up sights from the factory
- Free-float quad rail for accessory mounting
Key Variants
Ruger SR-556 Standard
The original model featuring quad rails and three supplied Magpul PMAGs--ideal for general-purpose use.
Ruger SR-556E
A streamlined, more affordable version with fewer accessories--great for budget-conscious buyers.
Ruger SR-556 Takedown
Features a quick-detach barrel and takedown design--convenient for transport and storage.
Competitor Comparison Table
| Feature | Ruger SR-556 | Sig Sauer 516 | LWRC IC-SPR |
|---|---|---|---|
| MSRP | $1,995 (discontinued) | $1,699 | $2,299 |
| Capacity/Size | 30+1, 16.1 in. barrel | 30+1, 16 in. barrel | 30+1, 16.1 in. barrel |
| Weight | 7.94 lbs | 7.3 lbs | 7.0 lbs |
| Optics-Ready | Yes (flip-up irons) | Yes | Yes |
| Trigger Type | Standard MIL-SPEC | MIL-SPEC | Enhanced GI-type |
| Notable Pro | Adjustable piston + rugged build | Military pedigree and parts commonality | Lightweight with top-tier fit & finish |
| Notable Con | Heavier than average ARs | Limited aftermarket vs. DI platforms | High cost |
Best Use Cases
- Home defense with maximum reliability
- Law enforcement patrol rifle
- Preparedness and SHTF planning
- AR-15 training platform with reduced fouling
- Collectors seeking discontinued premium ARs
FAQs
Can I still buy a Ruger SR-556 new?
No. Ruger discontinued the SR-556 line, but used models are widely available in good condition.
What is the difference between the SR-556 and SR-556E?
The SR-556E is a budget version with a lighter barrel and simplified furniture, but same action.
How does the SR-556 compare to direct impingement ARs?
The SR-556 runs cleaner and more reliably under adverse conditions due to its gas piston system.
