20" 5.56 Lightweight Contour 1:9 Rifle Length Barrel w/FSB

20" 5.56 Lightweight Contour 1:9 Rifle Length Barrel w/FSBThe OEM Black Rifle Depot 20" 5.56 Lightweight Contour Barrel with rifle-length gas system and 1:9 Twist has an FSB. Be sure to take advantage of the beneficial savings by getting an OEM Black Rifle Depot AR-15 Barrel for your next build.Features Mag Phosphate Finish Lightweight Barrel Profile Rifle Length Gas System 0.750 Gas Block Journal 20" Barrel Length 5.56 NATO Barrel Chamber 1:9 Twist Rate 1/2x28 Front Thread Pattern American Made - Sourced from a variety of Tier 1 Manufacturers here in the United States Quality Control - All barrels are manufactured under ISO-9001 or better quality standards MOA Guarantee - All barrels 16 and longer are guaranteed to hold 1 MOA or better using properly weighted match-grade factory ammo and shooting from a rest. Best Value for the MoneyNOTE: FSB is not F-Marked