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The M400 barrel is hammer forged chrome moly vanadium, meeting the material mil-spec. It is not nitrided. It is phosphate-finished with a chrome lining, and proof tested.
Drew, yes Sir. The M400 has a 16-inch chrome-lined 16" Stainless Steel (Matte Bead Blasted Finish) barrel with a 1:7-inch twist.
NO, the "Sig M400 TREAD" does NOT have a Chrome Lined Barrel...This Rifle has a STAINLESS STEEL Barrel with a 1 in 8" Twist Rate which is one of the Best Barrel materials and Twist Rates when it comes to accuracy and performance.
Yes, the barrel is chrome lined.
A good practice is to check with the manufacturer's website. As of this writing, the specifications state that the barrel is stainless steel.
