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Yes it does Alejandro : This has A 16" Nitride treated barrel is chambered in 5.56mm NATO.

It is a Chrome lined barrel not a Nitride treated barrel The SIG516 Patrol FDE in Flat Dark Earth with a matching FDE Cerakote® finish on both the upper and lower receivers and aluminum handguard. As with all SIG516 Patrol rifles, the Flat Dark Earth use the SIG SAUER innovative short-stroke gas pushrod operating system, which reduces chamber debris and allows the rifle to run cleaner and cooler. This system, along with the SIG SAUER proprietary fully supported extractor enables the SIG516 to be one of the only rifles to pass NATO's "Over the Beach" test. ********A 16" chrome-lined barrel******** is chambered in 5.56mm NATO and is surrounded by a free-floating aluminum forend. The top rail is optic-ready and includes SIG SAUER flip-up iron sights. Firearm Specifications •Item Number: R516G2-16B-P-FDE •Action: Semi-Auto •Operating System: Short-stroke gas pushrod •Caliber: 5.56mm NATO •Overall Length: 36.7in (extended) 33.0in (Collapsed) •Trigger Type: MIL-SPEC •Trigger Weigh

on further review the sig site says its Nitride treated CALIBER 5.56 NATO MAG TYPE AR-15 Details One of the most tested and proven weapons systems in the world achieves ultimate refinement in the SIG516 rifle. With its Nitride treated, military grade barrel and adjustable, four-position gas regulator, the piston-driven SIG516 incorporates all of the most desirable mechanical improvements. Add to these a free-floating forend and FDE Cerakote finish, and you have the most advanced, versatile AR-based rifle available. but others say Chromed I suggest contacting sig to be 100% sure SIG SAUER, Inc. 72 Pease Boulevard Newington, NH 03801 Phone: 603-610-3000 Fax: 603-610-3001

on further review the sig site says its Nitride treated CALIBER 5.56 NATO MAG TYPE AR-15 Details One of the most tested and proven weapons systems in the world achieves ultimate refinement in the SIG516 rifle. With its Nitride treated, military grade barrel and adjustable, four-position gas regulator, the piston-driven SIG516 incorporates all of the most desirable mechanical improvements. Add to these a free-floating forend and FDE Cerakote finish, and you have the most advanced, versatile AR-based rifle available. but others say Chromed I suggest contacting sig to be 100% sure SIG SAUER, Inc. 72 Pease Boulevard Newington, NH 03801 Phone: 603-610-3000 Fax: 603-610-3001