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its a standard profile barrel Cold hammer-forged 4140 chrome-moly steel barrel with ultra-precise rifling provides exceptional accuracy, longevity and easy cleaning. The 1:8" twist rate stabilizes bullets from 35 to 77 grains, and the 5.56 NATO chamber allows the use of both 5.56 NATO and .223 Rem. ammunition. M4 feed ramps provide improved reliability, and the matte black nitrided finish provides corrosion resistance.

Matthew, this rifle has an 18 inch medium profile Cold hammer-forged 4140 Chrome-Moly steel barrel. Ruger Customer Service can give you exact specifications at Telephone: 336-949-5200 (Monday through Friday 8:00am - 6:00pm ET)