Ruger 5.56MM NATO Upper Assembly

  • Model: 90356
  • Shipping Weight: 14.15lbs
  • Manufactured by: Ruger
  • UPC: 736676903566


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SR-556 OPERATING SYSTEM w/UPPER RECEIVER ASSEMBLY A complete assembly to upgrade your existing AR to the SR-556 2-Stage, piston-driven operating system w/upper receiver assembly. Features chrome-lined, cold hammer-forged barrel & chrome plated bolt carrier group. Includes folding back-up iron sights, quad rail handguard, soft-sided case, & (3) magazines.
  • Caliber: 5.56mm NATO/.223 Rem.
  • Barrel: 16.12"
  • Catalog Ref: RUG90356

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