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It is a 1:8 twist with 5R rifling, Full specs here https://ruger.com/products/ar556MPR/specSheets/8542.html
Brandon, this rifle has an 16.1 inch 4140 Chrome-Moly Steel Cold Hammer Forged Barrel with a 1:8" Twist Rate, Five Groove Rifling & Muzzle Threaded 1/2-28 TPI. Cheers and stay safe!
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.
