Add power, precision, and expanded customization options to your rifle with an Aero Precision M5E1 .308 Barrel Complete Upper Receiver. While there's several options to choose from, all of these AR15 Upper Receivers brought to you by Aero Precision feature a precision machined 7075 T6 aluminum upper for added strength that won't weigh you down in the field. For ease of use, the Aero Precision M5E1 .308 Barrel Complete KeyMod Upper Receiver comes with the forward assist and port door installed, and the handguard mounting platform is forged right into the receiver. The aesthetic adds a sleek look to your firearm, and the functionality will greatly improve every aspect of your shooting experience. You also get a Gen 2 enhanced handguard with a continuous top rail that supports the attachment of optics, lights and other accessories that will improve your accuracy or visibility wherever you need it, providing unmatched performance at the range or on the hunting grounds. Install this Aero Precision M5E1 Enhanced .308 Complete Upper Receiver for a durable component that upgrades the quality of your gun. Specifications for Aero Precision M5E1 20in .308 Barrel Complete Upper Receiver with Flash Hider: Manufacturer: Aero Precision Caliber: .308 Winchester Overall Length: 30 in Barrel Length: 20 in Barrel Profile: M4, Heavy Gas System Length: Rifle Length Barrel Twist Rate: 1-10 Threads per Inch: 5/8x24 Muzzle Device: A2 Flash Hider Gun Model: M5 Condition: New Fabric/Material: CMV Steel, 7075-T6 Aluminum Gas Block Journal Size-Diameter: .750 in Handguard Length: 15 in Handguard Style: Round Rail Gun Rail: Picatinny Gun Type: Rifle Gun Make: Aero Precision Included Accessories: None Bolt Carrier Group Included: No Charging Handle Included: No Weight: 60 oz Magazine Included: No Mount Type: M-LOK Country of Origin: USA Features of Aero Precision M5E1 20in .308 Barrel Complete Upper Receiver with Flash Hider Accepts standard AR .308 components Comes with forward assist and port door installed Handguard mounting platform is forged into the receiver Compatible with low profile gas blocks Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Additional milling along flats to aid with gripping and add visual appeal New profile for the continuous picatinny top rail DPMS Barrel Extension HP and MPI Tested Does not include bolt carrier group or charging handle Package Contents: Aero Precision M5E1 20in .308 Barrel Complete Upper Receiver with Flash Hider M5E1 Assembled Upper Receiver Gen 2 Enhanced Handguard of Choice 20in .308 CMV Barrel Low Profile Gas Block and Rifle Length Gas Tube