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The M&P 15T II rifle features a free-floating, 16-inch barrel with 5R rifling and a twist rate of 1:8. The latter is the effective middle-of-the-road twist that allows a rifle to easily and accurately employ both heavier and light projectiles

Hi Jonathan and welcome. This rifle has a 16-inch Black Armornite 5-R Barrel with a 1 in 8 Twist Rate and M4E Flash Hider. Cheers, stay safe and enjoy!