Ruger AR-15 SR-556FB Flat-Top Gas Piston Upper Receiver Assembly 5.56x45mm NATO

Product #: 214213 Ruger #: 556UFB UPC #: 736676903566
$1,127.99

Please Sign In to use this feature.

Product Information

The Ruger AR-15 556 Mid Length Gas Piston Upper Assembly is chambered in 5.56x45mm NATO and is ready to install on any standard AR-15 lower. Upper features a 16" chrome lined barrel with A2 flash hider and comes with a complete bolt carrier group, charging handle assembly, and a set of Troy Industries BattleSights. Also includes a tactical soft carbine case with the Ruger® logo.

  • Two-Stage Piston: 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 deliver 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, laser or other accessories.

  • Troy Industries Sights: Provides a windage adjustable rear sight and an elevation adjustable front sight that co-witness with Mil-Sepc 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.

  • Hammer-Forged Barrel: Cold hammer-forged, chrome lined Mil-Spec 41V45 barrel ensures accuracy and longevity. Features a 1 in 9" right hand twist with 6 grooves and is threaded 1/2"x28.

  • Magazines: Includes three 30-Round MagPul Pmag magazines.

  • Also Features: Chrome-plated bolt, one-piece bolt carrier and extractor and rail covers.

    Technical Information
    • Upper Receiver: AR-15 Flat-Top Gas Piston Upper
    • Barrel Length: 16"
    • Barrel Contour: M4
    • Barrel Material: 41V45 Mil-Spec Chrome Lined, Cold Hammer Forged
    • Muzzle Thread Pattern: 1/2"-28
    • Chrome Lined: Yes
    • Barrel Finish: Matte
    • Twist Rate: 1 in 9"
    • Chamber: 5.56x45mm NATO
    • Bolt Carrier: Chrome Plated Bolt, One-Piece Bolt Carrier
    • M4 Feed Ramps: Yes
    • Muzzle Device: A2 Flash Hider
    • Gas System Length: Carbine
    • Gas Block Diameter: Two-Stage Piston
    • Handguard: Quad Rail, Free Float
    • Sights: Troy Industries Front and Rear Folding Sight
    • Extras: 3 Low Profile Rail Covers, 3 30-Round MagPul Pmag Magazines
    • Weight: Not Listed by Manufacturer

    Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.

  • Was this information helpful? Yes No

    Thank you for your opinion. We appreciate your input!

    Please Help Us Improve

    Please enter the missing required fields:

      Please describe why the information was not helpful.

      *Indicates a required field

      Know someone who may like this? Email this Page to a Friend

      Customer Reviews

      The statements and opinions expressed within Customer Reviews reflect each author's personal perspective and do not imply endorsement by MidwayUSA, its Employees or any other organization. Customers should in no way infer that MidwayUSA has validated review information as safe, accurate or appropriate.

      NOTE: Prices, specifications and availability are subject to change without notice.
      We reserve the right to correct typographic, photographic and/or descriptive errors.
      Recently Added
      Suggested Products