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5.56 AR 15 Upper Assembly - 16" Nitride Barrel, 1:8 Twist Rate with 15" M-Lok Handguard

$379.99
SKU:
5561618(B)-MLOK(15)_AR15-CH_BCG-N
Availability:
In Stock! Fast Shipping!

So you've started building your own AR-15. You've gotten as far as building the bottom half, and you're now ready to knock out that upper assembly to complete your build. So we'll make you a deal: if you can turn a screwdriver or crank a socket wrench to install backup sights or optics, we've got your upper assembly.

This prebuilt upper assembly arrives at your door with a 16-inch barrel coated in black nitride, 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 a prebuilt upper assembly only. 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: Black Nitride
  • 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 Restrictions

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.

Caliber:
5.56
Barrel Size:
16"
Twist Rate:
1/8
Barrel Finish:
Nitride

We are a national retailer of individual components and not all products depicted on this website are legal in every state. Shipping of various products found on this website are prohibited to some states (such as California, Connecticut, District of Columbia, Hawaii, New Jersey, New York, Rhode Island, and Washington). The information, pictures, text or products presented on this website are not a representation by us, and should not be understood by you, that any product or completed firearm is legal to assemble or own in your state of residence. We encourage each and every builder to perform their own research about the state and federal laws that apply to them. It is your responsibility to understand the law and we encourage you to consult with an attorney or your local ATF representative.