The Colt 11.5" complete upper is a high quality and durable upper receiver for your AR-15. This upper is the total package with unrivaled strength and reliability allowing you to confidently navigate any scenario. It arrives ready to mount to a complete lower receiver and includes a charging handle, a complete chrome-lined bolt carrier and steel barrel. It boasts a polymer handguard with the strength and durability to withstand heavy use and abuse. This upper receiver is chambered in 5.56 NATO/.223 with a 11.5" barrel and a 1:7 twist rate. It features chrome lined bolt carrier providing the highest quality and unrivaled durability. The Colt complete upper is hammer forged from mil-spec 7075-T6 aluminum with a type III hard coat providing the strength and toughness to withstand the most severe abuse and provide maximum corrosion resistance. It features an A2 front sight and Magpul BUIS rear sight for confident target acquisition and optimal performance in all conditions. This Colt 11.5" 5.56 NATO LW Complete Upper with FSB receiver checks all the boxes with 7075-T6 aluminum, type III hard coat anodized finish, a 1:7 twist rate and chrome line bolt carrier.Features:Manufactured by ColtDirect Impingement Gas SystemFront Sight Base (FSB)5.56 NATO/ .2231:7 twist rate11.5" lightweight barrel7075-T6 aluminum upper receiverType III anodized hard coatA2 front sightMagpul BUIS rear sightStandard polymer handguardBlack finishColt Manufacturing knows firearms. They have been designing them since the first patent made by Samuel Colt in 1836 and they know what it takes to bring quality products to the market for both military and civilians. If you want a firearm proven by time, you can't go wrong with a Colt.