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



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.

A mil-spec M4 Gov barrel paired with a lightweight M-Lok free-float.

This M-Lok-equipped, Government-profile AR15 kit is the perfect build choice for a lightweight, compact, accurate shooter. The 4150 CMV barrel’s been finished with a Nitride QPQ finish to improve barrel and rifling life without sacrificing accuracy. 

The skeletonized M-Lok handguard provides a Picatinny rail for a flip-up front sight, ditching the main rail to shave serious weight, coming in at around 7.5 ounces. Everything else is mil-spec: M4 upper with feed ramps, M16 BCG, mil-spec parts kit, and an M4 buttstock.

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

AR-15Lowerreceivers.com only ships within the United States. Federal legislation dictates we cannot ship our products internationally. 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 (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. We try our best to keep our shipping page current, but laws change daily.

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.