So you're half-way done with building your own AR-15. In building the lower assembly, we can tell you the hardest part is over. Because if you can turn a screwdriver, allen wrench, or socket wrench to install backup sights or optics, we'll take care of building your upper assembly. See? You already did the hard part.
This prebuilt upper assembly arrives with a 16-inch parkerized barrel, chambered in 5.56mm NATO, and made of 4150 chrome moly vanadium steel. It's been paired with a 15-inch free-floating MLOK handguard. It also comes with the charging handle and BCG. All you need to do is install the sights or optic of your choice and then mount it onto your completed lower assembly. You can rest easy with the top half of your build now. You've done a hell of a job. We'll take it from here.
PLEASE NOTE: This is not a firearm. This is only a prebuilt upper assembly. It includes an assembled upper receiver, bolt carrier group, and charging handle.
New to ARs? Here's how to build an AR-15.
AR-15 Rifle Upper Assembly Specs
Barreled upper assemblies are assembled in-house before shipment.
Barrel
- Chamber: 5.56mm NATO
- Contour: M4/Government
- 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: Parkerization
- Process: Button Rifled
- Lining: None
- Extension: M4
- Muzzle: A2 “Birdcage” Flash Hider
Handguard
- Attachment System: 15" M-Lok, Lightweight
- Finish: Type III Hardcoat Anodized (Mil-Spec)
- Top Rail: M1913 Picatinny
- Material: Billet 6061-T6 Aluminum
- Attachment: Barrel Nut
Stripped Upper Receiver
- 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
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.
