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Hi Broderick, Its a 16" 4140 Steel Barrel with a 1:9" Twist-- The Smith & Wesson Military & Police model 15 Sport II Optics Ready is designed to the exact same specs as other S&W M&P15 rifles. Built for a variety of applications including recreational and professional shooting, the Sport II is the ideal entry level AR style rifle. The M&P 15 features a 1:9" twist barrel with a railed gas block. The flat top style upper receiver is ready for any optic of your choosing. --- Specifications and Features: Smith & Wesson M&P-15 Sport II OR 10159 -- AR-15 Semi Automatic Rifle -- Direct Gas Impingement-- 5.56mm NATO accepts .223 Remington -- 30 Rounds -- >>>>>16" 4140 Steel Barrel with a 1:9" Twist -- 7075 T6 Aluminum Upper and Lower Receivers -- Railed Gas Block -- 6 Position CAR Stock -- A2 Style Polymer Hand Guard -- Hardcoat Anodized Black -- Overall length 35" Extended -- Overall weight 6.51 lbs Made in the USA

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No 2 stage trigger either.

It has a • Armornite® Finish on Barrel (Interior & Exterior) FArmornite® finish is a hardened nitride finish that provides: Enhanced corrosion resistance, greatly improved wear resistance, decreased surface roughness, reduced light reflection and increased surface lubricity. Armornite is used on many S&W® and M&P® products imparting a high level of protection internally and externally where applied.Features • Gas Block with Integral Picatinny-Style Rail • QD Sling Swivel Attachment Point (bottom of gas block) • Chromed Firing Pin • Armornite® Finish on Barrel - Interior and Exterior • Forged, Integral Trigger Guard • Forward Assist & Dust Cover • 1 in 9" Twist • Threaded Barrel • 30 Round PMAG®

Hi Broderick, I would stick with Smith and Wesson's description on this rifle here : https://www.smith-wesson.com/firearms/mp-15-sport-ii