Ruger AR-15 SR-556FB Gas Piston Upper Receiver Assembly 5.56x45mm NATO 16" Barrel
- 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
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: Commerical
- 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.
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