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The barrel is heavy contour not chromed but the bolt gas chamber is.

heavy contour barrel not chrome lined . The inside diameter of the carrier and gas key are chrome plated. "Equipped with a heavy contour, cold hammer-forged alloy barrel with 1:8" twist rifling that provides exceptional accuracy with bullets from 35 to 77 grains. M4 feed ramps and 5.56 NATO chamber allows the use of both 5.56 NATO and .223 Rem. ammunition. The barrel and 1/2"-28 Ruger® flash suppressor have a matte black oxide finish to reduce glare and provide corrosion resistance." and "Made from 7075-T6 hard-coat anodized aluminum forgings, shot-peened and proof-tested 9310 steel bolt, and 8620 steel bolt carrier. The inside diameter of the carrier and gas key are chrome plated and the key is staked for longevity." full specs here https://ruger.com/products/ar556/specSheets/8511.html

Jess, yes, this is a 16.1" Cold Hammer Forged, Threaded Heavy Barrel (Not Chrome Lined) Model with a 1:8" Twist and Muzzle Threaded 1/2-28 TPI. The inside diameter of the Carrier and Gas Key are chrome plated and the key is staked for longevity.

Jess, With the cold hammer forged heavy contour Type III Hard Coat Anodized barrel and chrome lined BCG this sporting rifle is one of the best values on the market.