5.56 AR 15 Rifle Kit – 16″ Phosphate Barrel 1:7 Twist Rate with Classic A2 Handguard

Some people have a weakness for classic things. Some of those classic-loving people reminisce about classic firearms. You probably know someone like this. They can list everything that makes the 1911 timeless in alphabetical order, or tell ya all about how the M-16 used to “jam like a sumbitch.” They might even have personal experience with the damned thing. If you’re the type, you’ll love this build kit, because you’ll get most of the parts you need to build an AR with an old-school M4A2 look. Everything about this kit is all about “mil-spec,” too, except for the barrel treatment: We axed the chrome lining in the barrel in favor of a full phosphate treatment to provide even more accuracy and better protection against the elements.
What’s Included
Here’s the beginner’s guide to 80% lowers.
AR-15 Rifle Kit Specs
Barreled uppers are assembled in-house before shipment.
Barrel

Chamber: 5.56 NATO
Contour: M4/Government
Length: 16”
Twist Rate: 1:7
Gas System: Carbine
Gas Port: 0.750”
Gas Hole Dia.: 0.070”
Muzzle Threads: 1/2×28
Feed Ramps: M4
Material: 4150 CMV
Finish: QPQ Nitride
Process: Button Rifled
Lining: Phosphate
Extension: M4
Muzzle: A2 “Birdcage” Flash Hider

Handguard

Attachment System: Two-Piece “A2” Handguard
Finish: Matte Black
Top Rail: None
Material: Polymer
Attachment: Delta Ring

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: 9310 Tool, HPT/MPI-tested
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

This kit is not a firearm. It includes an assembled upper receiver, bolt carrier group, lower parts kit, and buffer assembly with the buttstock. It does not include the component to make a firearm: A stripped lower receiver. Pair this rifle kit with an AR-15 80% lower receiver and AR-15 jig to fabricate a receiver, sold separately.
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 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.