With so much “tacti-cool” stuff hitting the black rifle market, there’s nothing wrong with taking a step back and building a truly classic shooter. This Classic AR-15 Rifle Build features an old-school A2-style upper, complete with an A2 front sight post, A2-style “birdcage” flash hider, and a traditional forged M4 flattop upper.
Inside, you’re getting a mil-spec lower parts kit and a chrome-lined M16 bolt carrier group with staked gas key and M4 feed ramps. The 4150 CMV barrel promises MOA accuracy with bomb-proof reliability.
This is not a firearm. It includes an assembled upper receiver, bolt carrier group, and a charging handle.
AR-15 Upper Assembly Specs
Barreled uppers are assembled in-house before shipment.
Chamber: 5.56 NATO Contour: M4/Government Length: 16” Twist Rate: 1:7 Gas System: Mid-length Gas Block: A2-type FSB Gas Port: 0.750” Gas Hole Dia.: 0.070” Muzzle Threads: 1/2x28 Feed Ramps: M4 Material: 4150 CMV Finish: Phosphate Process: Button Rifled Lining: QPQ Nitride Extension: M4 Muzzle: A2 “Birdcage” Flash Hider
Attachment System: A2 Handguard
Finish: Matte black
Top Rail: None
Attachment: Delta ring
Profile: M4 Flattop
Material: Forged 7075-T6
Aluminum Finish: Type III Hardcoat Anodized (Mil-Spec)
Bolt Carrier Group
Steel: Carpenter No. 158 (Mil-Spec)
Exterior: Black Nitride
Interior: Black Nitride
Gas Key: Staked
Charging Handle: Included
WARNING: Handling firearms parts and accessories can expose you to lead and other petroleum products known to the State of California to cause cancer and reproductive harm. For more information go to: www.P65Warnings.ca.gov
Shipping of various parts and/or accessories are prohibited to states and locales (ie New Jersey, California, New York, etc…) with restrictions against certain parts and/or accessories or "assault weapons" (i.e. states with high-capacity magazine restrictions, manufacturing of semi-automatic weapons, etc..). It is your responsibility to be aware of your local firearms laws before purchasing from our website or machining a firearm. We try our best to keep our shipping page current, but laws change daily.
GunBuilders.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.