The flat top M4 Mil-Spec upper receiver is forged CNC Machined from 7075-T6 Aluminum, the hardest and most durable material of any upper! To ensure even more strength they are hard coat anodized.
The Straight Fluted 20” .223/5.56 Wylde barrel is the perfect marriage of design and precision! The Wylde phosphate barrel fires 5.56 or .223 ammo in less than 1” groupings at 100 yards! This heavy barrel is made from the highest quality 4150 Chrome Moly Steel for accuracy and durability! This barrel comes with either a 1:8 twist rate, rifle gas system and head spaced twice from the US manufacturer.
This incredible rail has 200% increase in keymods, so your attachment position options are endless! This rail was designed for shooters that want BUIS at 45-degree angle with no additional costs for attachments. The rail is a 15” CBC Keymod rail made from Airplane Aluminum and then hard coat anodized to improve the strength!
Product Details: AR-15 Upper Assembly – 20″ / .223 | 5.56 / Straight Flute / 1:8 / 15″ CBC Arms Gen 2 Keymod AR-15 Handguard / Rail
➲ Upper Receiver
The foundation of all good AR\'s is built upon a dependable upper receiver. CBC upper receivers offer best-in-class quality while providing you years of dependable service. Boasting a MIL-SPEC type III hard coat anodized finish and machined from 7075-T6 forged aluminum, this M4 flat-top receiver delivers a lifetime of superior function. You want your AR built upon a solid platform - this receiver gives you the confidence that your AR-15 will function when it counts most.
➲ .750 Low Profile Gas Block
Constructed from 4150 hardened steel and features a secure dual-set screw mounting design
➲ A2 Flash Hider
Is machined from quality steel and finished with a corrosion resistant nitride finish.
CBC provides a wide selections of AR-15 upper assemblies in a variety of styles and lengths - all partial AR-15 uppers are assembled with everything less the charging handle and bolt carrier group. Our partial upper assemblies offer quality and performance that will satisfy the most demanding shooter. Better yet, all CBC AR-15 uppers are custom built-to-order enabling us to provide you with the best prices you will find anywhere. The quality of our AR-15 uppers are backed by our Lifetime Warranty - if any CBC upper assembly becomes defective, we will repair or replace it at no charge. Get your AR-15 upper assembly at CBC today and save with free shipping!