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Eve, this rifle has a "Carbon Steel medium profile barrel. Barrel heat up will depend on your rate of fire between shots.

Eve - This rifle has a medium barrel profile. The barrel is made of carbon steel. The M&P15-22 SPORT features a 10-inch M&P slim handguard that incorporates the popular Magpul M-LOK™ system. The M-LOK system allows rifle owners to easily customize their M&P15-22 SPORT by adding accessories without removing the handguard. M&P15-22 SPORT owners have the option of easily mounting numerous M-LOK-compatible accessories or any number of Picatinny-style rail sections designed to accommodate other accessories. Smith & Wesson includes a 2-inch M-LOK rail panel with each rifle. The M&P15-22 SPORT comes standard with one of the most popular folding sights systems available for MSRs. The removable Magpul MBUS® front and rear folding sights are lightweight and durable, further enhancing the performance and value of the new M&P15-22 SPORT. As far as the barrel heating up, barrels begin to heat up with the first shot fired. How much they heat up depends on the individual shooters rate of fire.