Brownells 75th Anniversary - A Shooting Heritage

Have you ever wanted to build out an AR-15 but have been unsure of what all components you need, or concerned that the parts might not all fit and work in conjunction with each other?
Maybe you just want the convenience of purchasing one kit with nearly all the quantity AR-15 parts you’ll need to build out a complete AR-15.

If so, then the Brownells M4 Build Kit is just what you need.

This kit contains everything you need, with exception of the lower receiver and sights, to build a quantity AR-15.

Each Brownells M4 Build Kit has a 16” nitride barrel chambered in 5.56 NATO and a 1/7 rate of twist. The barrel profile is M4 and has M4 feed ramps. For a gas system we went with the reliable carbine length system, that has a low-profile gas block secured in place with set screws. And on the muzzle end we’ve included the classic A2 birdcage style flash hider.

The handguard is a 15” slim profile, free float design that has a picatinny rail running the entire length of the 12 o’clock position, and M-LOK slots at 3, 6, and 9 o’clock.

The upper itself is a forged flat top design and has the ejection port and forward assist installed.
For the Complete Upper Receiver, the Bolt Carrier Group is the standard, M16 profile and has been magnetic particle inspected with a nitride finish. The Charging Handle is a standard Mi-Spec design.

Once you purchase the lower receiver of your choice (sold separately) the Build Kit has you covered for finishing out your lower receiver.

A complete Mil-Spec lower parts kit has everything you’ll need, including an A2 pistol grip, and a six-position buffer tube, buffer, buffer spring, and stock complete the kit.

Now, grab your tools, get to your work bench, and turn the Brownells M4 Build Kit into your next AR-15.


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Cartridge: 5.56 mm NATO

Finish: Black

Style: Complete

Contour: M4

Length: 16"

Muzzle: 1/2-28, ...

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