https://vizardsgunsandammo.com/copy-of-ruger-8542-ar-556-5-56-nato-30-1/

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The Ruger AR-556 is chambered in 5.56 NATO with M4 feed ramps provide improved operational reliability. The cold hammer-forged barrel has ultra-precise rifling for exceptional accuracy, longevity, and easy cleaning. Its upper receiver is forged from 7075-T6 aluminum and includes a forward assist, dust cover, and brass deflector. It has a Bravo B5 style black synthetic buttstock and Mil-Spec buffer tube.

RUG 8542 AR556 5.56NATO 16.10 TB B5 STK 30R
Mfg Item Num: 8542
Model Number: AR-556
Unit of measure: GN
Caliber: 5.56 NATO
Capacity: 30+1
Trigger: Two-Stage
OAL: 33-36.25
Weight: 6.70 lbs
Sights: None Picatinny Rail
Barrel Description: Cold Hammer Forged
Twist: 1:8
Weight Range: 6 lbs to 6.99 lbs
Stock Finish Group: Black
Metal Finish Group: Blued/Black