Ruger AR-556
Sturm, Ruger & Company · Carbine · In Production · 2014
Also known as: Ruger AR556, Ruger Modern Sporting Rifle, AR-556 Model 8500
Overview
The Ruger AR-556 is an entry-level AR-15 carbine introduced in 2014 as Ruger's first foray into the modern sporting rifle market. Designed to provide reliable performance at an accessible price point, the AR-556 features a 16.1-inch medium-contour cold-hammer-forged barrel constructed from 4140 chrome-moly steel with a 1:8 twist rate that stabilizes bullets from 35 to 77 grains. The barrel includes M4 feed ramp cuts and is threaded 1/2-28 with a Ruger flash suppressor. Weighing 6.5 pounds empty, the carbine utilizes traditional direct impingement gas operation with a carbine-length (7-inch) gas system. The forged 7075-T6 aluminum upper and lower receivers feature matte-black hard-coat anodized finish, with the flat-top upper providing a full-length Picatinny rail for optics mounting. The rifle comes equipped with a milled F-height gas block with fixed front sight post and Ruger's Rapid Deploy folding rear sight. The bolt is machined from 9310 alloy steel for enhanced durability. Standard furniture includes a six-position telescoping stock, improved trigger-reach grip, and enlarged trigger guard. The carbine ships with one 30-round Magpul PMAG, front sight adjustment tool, owner's manual, and cable lock.
Specifications
| Weight (empty) | 2948 g (104.0 oz) |
| Weight (loaded) | 3518 g (124.1 oz) |
| Overall Length | 914 mm (35.98") |
| Barrel Length | 409 mm (16.10") |
| Action Type | Gas Operated Direct Impingement |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Single Stage |
| Trigger Pull | 31 N (7.0 lbf) |
| Magazine Capacity | 30 rounds |
| Magazine Type | Detachable Box |
| Muzzle Velocity | 905 m/s (2969 fps) |
| Muzzle Energy | 1640 J (1210 ft·lbf) |
| Effective Range | 500 m (547 yd) |
| Maximum Range | 3600 m (3937 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 203 mm (7.99") |
| Number of Grooves | 6 |
| Frame Material | Aluminum Alloy |
| Barrel Material | Steel |
| Stock Material | Polymer |
| Finish | Hard Anodized |
Calibers
- 5.56x45mm NATO · primary · 5.56x45mm NATO — also known as 5.56mm NATO, 5.56x45mm, .223 Remington
Features
- Firing modes: Semi Automatic
- Feed systems: Detachable Box Magazine
- Safety mechanisms: Manual Safety Selector
- Features: Carbine Length Gas System, Rotating Bolt, Flat Top Receiver, Picatinny Rail, M4 Feed Ramps, Forward Assist, Dust Cover, Cold Hammer Forged Barrel, Medium Contour Barrel, Ruger Flash Suppressor, Fixed Front Sight, Flip Up Rear Sight, Six Position Stock
Variants
- AR-556 MPR — Multi Purpose
- AR-556 Pistol — Pistol
- AR-556 Free-Float Handguard — Enhanced
Service history
Operators
- Civilian Sport Shooters · as AR-556
- Small Law Enforcement Agencies · as AR-556
Production
Production years: 2014-present
High-volume continuous production as Ruger's best-selling AR-15 variant
Origin
Country of origin: United States
Notes
The AR-556's introduction marked Ruger's recognition of the AR-15 market's growth and demonstrated their ability to produce a quality carbine at a competitive price point. Ruger leveraged their decades of manufacturing expertise and cold-hammer forging technology (used on their successful Mini-14 rifle line) to produce AR-556 barrels with excellent bore concentricity and surface finish. The 1:8 twist rate was a smart choice, providing excellent versatility for the wide range of 5.56mm ammunition available. Unlike some budget AR-15s, the AR-556 uses proper 9310 steel for the bolt rather than Carpenter 158, though 9310 actually provides superior strength and toughness. The medium-contour barrel profile balances weight and heat dissipation better than pencil-profile barrels. Some critics note the carbine-length gas system on a 16-inch barrel generates slightly more felt recoil than mid-length systems, and the fixed front sight base limits handguard options. However, these are minor tradeoffs for the rifle's street price, which frequently falls below $600. The AR-556 has earned a reputation as an excellent first AR-15 or budget truck gun. Ruger backs it with their standard lifetime service policy and typically fast customer service. Success of the original AR-556 led to numerous variants including the MPR (Multi-Purpose Rifle) with free-float handguard and 18-inch barrel, and pistol versions.
Background
When Ruger announced the AR-556 in 2014, many industry observers were surprised it took the company so long to enter the AR-15 market given their success with other rifle platforms like the Mini-14 and 10/22. The AR-556's introduction came at an opportune time when AR-15 demand remained high following 2013's political climate. Ruger's reputation for reliable firearms at fair prices translated well to the AR platform. The AR-556 quickly became one of the best-selling AR-15s in America, regularly appearing on 'best budget AR-15' lists and recommended by firearms instructors as a solid entry-level option. The rifle's success demonstrated that shooters valued reliability and manufacturer reputation over feature lists and brand cachet. Many AR-556 owners report excellent reliability and accuracy, with the rifle often outperforming its budget price point. The cold-hammer-forged barrel technology Ruger employed - common in their manufacturing but less so among AR-15 makers - became a selling point. Gun shop employees often recommend the AR-556 to first-time AR buyers, and many ranges keep them as rental guns due to their durability and low maintenance requirements. The AR-556 proved that Ruger's engineering philosophy of simple, reliable, affordable firearms translated perfectly to the AR-15 platform.