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John, this rifle has a 16" Double Lapped Chrome Lined CMV Barrel with 1:7 Twist Rate & Threaded 1/2x28 TPI with Flash Suppressor. Cheers and stay safe!

Then you're in luck. Starting with the 7075-T6 forged aluminum upper and lower receivers it's equipped with a 16" double lapped chrome lined barrel with a 1:7" twist. It has a 1/2x28 TPI threaded muzzle that sports a birdcage style flash hider. Featuring an A2 pistol grip, polymer handguards, and a 6 position collapsible stock, the M-15 is everything you expect from a standard basic AR-15. Hope this helps.

This one has a 1:7 twist rate. Full specs here https://www.armalite.com/SACItem.aspx?Item=DEF15F