5.56 AR 15 Rifle Kit (16″ Nitride Barrel & 13.5″ M-Lok Handguard) w/ 80% Lower – (1:7 Twist)

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Please Note: Given the current demand for this product and supply shortages, your order may ship with a black hammer and trigger or a stainless steel hammer and trigger.

Mil-Spec (4150) M4 Barrel with QPQ Nitride and Custom, Ultra-Light 13.5" Handguard.

This ultralight AR-15 barreled upper receiver ships ready to provide MOA accuracy with a hardened mil-spec barrel and the industry’s most protective and accurizing finish, QPQ Nitride. Providing plenty of rail estate in a lightweight configuration is our new, custom-made aluminum 13.5" M-Lok handguard. This upper comes complete with a quality chrome-lined M16/Full-Auto BCG and charging handle resting inside a mil-spec forged M4 flattop upper.

What’s Included & Specifications


Chamber: 5.56 NATO
Contour: M4/Government
Length: 16"
Twist Rate: 1:7
Gas System: Carbine
Gas Port: 0.750
Thread Pitch: 1/2x28
Feed Ramps: M4
Material: 4150 CMVS
Finish: Black Nitride QPQ
Process: Button Rifled
Lining: Black Nitride
Extension: M4
Muzzle: A2 “Birdcage” Flash Hider


Attachment System: M-Lok
Finish: Type III Hardcoat Anodized (Mil-Spec)
Top Rail: Mil-Spec 1913 Picatinny
Material: Billet 6061-T6 Aluminum
Weight: 7.5 oz.
Inner Diameter: 1.355”
Barrel Nut: Included

Stripped Upper Receiver

Profile: M4 Flattop
Material: 7075-T6 Aluminum
Finish: Type III Hardcoat Anodized (Mil-Spec)

Bolt Carrier Group

Profile: M16/Full-Auto
Steel: Carpenter No. 158 (Mil-Spec)
Exterior: Phosphate Finish
Interior: Chrome-Lined
Gas Key: Chrome-Lined, Staked
Charging Handle: Included

No FFL required  Made in the USA  Lifetime Warranty

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

80-Lower.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally.

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, 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.