Tired of the tactical overload? Build an old-school M4A2 forgery with this AR-15 “A2” Build Kit. It features a Classic flattop upper with a cold-hammer forged, 4150 CMV barrel – the best of the best, MOA accuracy. Out front, an O.G. A2 front sight post, drop-in A2 handguard and A2 “birdcage” flash hider handle the business end.
An M16 BCG goes to work with M4 feed ramps inside, and a Classic Lower Parts Kit ensures your trigger breaks clean with little creep or take-up. An original M4, six-position buttstock and buffer tops off the whole kit.
This kit is not a firearm. It includes an assembled upper receiver, bolt carrier group, lower parts kit, and buffer assembly with buttstock.
AR-15 Rifle Kit Specs
Barreled uppers are assembled in-house before shipment.
- Chamber: 5.56 NATO
- Contour: Straight
- Length: 16”
- Twist Rate: 1:8
- Gas System: Carbine
- 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: Two-Piece "A2" Handugard
- Finish: Matte Black
- Top Rail: None
- Material: Polymer w/ aluminum heat shield
- Attachment: Mil-Spec Delta Ring
- Profile: M4 Flattop
- Material: Forged 7075-T6 Aluminum
- Finish: Type III Hardcoat Anodized (Mil-Spec)
Bolt Carrier Group
- Profile: M16/Full-Auto
- Steel: Carpenter No. 158 (Mil-Spec)
- Exterior: Black Nitride
- Interior: Black Nitride
- Gas Key: Staked
- Charging Handle: Included
Lower Receiver Parts
- Buffer System: Mil-spec, Carbine
- Buttstock: Mil-spec, M4-type
- Parts Kit: Mil-spec, single-stage
Lower Receiver not 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.