This Midnight Edition 10.5" 5.56 NATO Complete Upper by DBI features a 416R SS M4 contour barrel chambered in 5.56 with a 1:8 twist. The barrel is then finished with Midnight Bronze Cerakote. Built on a top-tier t-marked Forged Upper Receiver and finished with Dirty Bird's 9.5 SMRS M-LOK V2 Handguard. No corners are cut when manufacturing these complete uppers. All barrels are dimpled and cold blued, use a steel low profile gas block and a stainless steel gas tube. The gas block set screws feature knurled cone tops and are installed using blue locktite ensuring that no amount of vibration will cause the set screws to come loose but they will still be removable for servicing if needed.This complete upper features an extended latch charging handle (Midnight Bronze latch matches the barrel) and a Dirty Bird Industries Enhanced BCG with a slick and durable QPQ Nitride finish.Made in the USA - Backed by Dirty Bird Industries' Limited Lifetime WarrantyBarrel Chambered in 5.56 (will also function with .223) 10.5 M4 Contour 1:8 Twist Carbine-Length Gas System 416R SS w/ Midnight Bronze Finish Midnight Bronze A2 Muzzle DeviceHandguard Patented ASAL (Anti-Slip, Anti-Lift) mounting system "Competition Cut" top railUpper Receiver Precision Machined from Top Tier 7075-T6 Aluminum Forgings (forge marks may vary) Not all forged uppers are created equal and we only use the best for our uppers meaning they will be free from excessive pitting, machined to spec and finished with quality (not purple or chalky) hard coat anodizing M4 Feedramps