Ruger SR-556C Review
Part 2 - What's In The Box and Specifications
December 28, 2010

When you purchase the Ruger SR-556C rifle, it will come in a box as shown below.

Figure 1
Ruger SR-556C Review

The end of the box was marked with a sticker shown below stating model number, serial number, catalog number, caliber and UPC code.

Figure 2
Ruger SR-556C Review

Once you open the box, you see that all the contents of the box are inside this black Ruger soft case.

Figure 3
Ruger SR-556C Review

The soft case has Velcro loops to secure the rifle against the side of the case  It also has two pockets to hold the other two Magpul PMAG 30 magazines.

Figure 4
Ruger SR-556C Review

Inside the case were the following items and are shown below with a light background for clarity:

Figure 5
Ruger SR-556C Review


The features and specifications shown below in colored italics were taken directly from the Ruger website on 12/27/10.  As I performed the review, I verified certain features and specifications and have made comments beside items as necessary to provide further clarification.


  • Two-Stage Piston With Adjustable Regulator provides a cleaner, cooler running, reliable firearm with superior operating endurance.  The two-stage piston provides a smooth power delivery stroke to the bolt carrier.  The four position gas regulator can be adjusted for optimum reliability and superior operating endurance.  The gas system may be closed completely for manual operation during training or when using a suppressor.
  • Quad Rail Handguard provides four Mil-Std 1913 Picatinny rails, and is in alignment with the flattop receiver, providing ample space for mounting sights, lights, lasers or other accessories.
  • Troy Industries Folding BattleSights™ provide a windage adjustable rear sight and an elevation adjustable front sight that co-witness with Mil-Spec optics and can be easily removed to make room for advanced optics.  The sights can be folded down with the simple push of a button or flipped up with your thumbs.
  • 6-Position Telescoping M4-Style Buttsotck houses a Mil-Spec buffer and spring.
  • Cold Hammer-Forged, Chrome-Lined Mil-Spec 41V45 Barrel ensures accuracy and longevity.
  • Hogue® Monogrip® Pistol Grip adds comfort when carrying or shooting.
  • Magazines: Supplied with three MAGPUL PMAG 30-round magazines (a lightweight 5.56 NATO magazine).
  • Also Features: chrome-plated bolt, one-piece bolt carrier and extractor, rail covers and soft case.


  • Catalog Number: SR-556C
  • Model Number: 5905
  • Caliber: 5.56mm NATO/.223 Rem.
  • Stock: Black Synthetic, Collapsible
  • Finish: Manganese Phosphate/Hardcoat Anodized (Manganese Phosphate on steel parts, Hardcoat Anodizing on aluminum parts)
  • Sights: Folding BattleSights™ (by Troy Industries)
  • Height: 7.75"
  • Barrel Length: 16.12"
  • Overall Length: 31.00" - 34.25"
  • Width: 2.50"
  • Weight: 7.40 lbs. (I measures 7.414 pounds for the gun with sights only and no rail covers or magazine)
  • Twist: 1:9" RH
  • Grooves: 6
  • Length of Pull: 10.25" - 13.50"
  • Capacity: 30 (Based on the  provided Magpul magazines.  Accepts standard magazines and capacity can change based on what magazine you use)
  • MA Approved & Certified: No
  • CA Approved: No
  • Suggested Retail: $1995

The photos below show some overall views of the Ruger SR-556C rifle.  As with most photos in my reviews, clicking on them will bring up a high resolution photo showing more detail.

Figure 6
Ruger SR-556C Review

Figure 7
Ruger SR-556C Review

Figure 8
Ruger SR-556C Review

Figure 9
Ruger SR-556C Review


In the next section, Part 3 of this review, I cover the externally visible features of the rifle in great detail and show even more overall photos of the rifle.  You can go back to Part 1 of this review for links to all the other parts of the review.

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