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    AR15 Low-Profile Gas Block - .750" AR15 Low-Profile Gas Block - .750" 2 AR15 Low-Profile Gas Block - .750" 3

    AR15 Low-Profile Gas Block - .750"

    Every gas-operated AR (those that don't use a piston system) uses a gas block of some type to cycle between shots. If you're building one of those old-school or retro style AR, yours may have a fixed front sight that doubles as the gas block or some...

    Was: $17.99
    Now: $14.99
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    AR10/AR15 Carbine Length Gas Tube

    AR10/AR15 Carbine Length Gas Tube

    If you want your AR-15, LR-308, or AR-10 to cycle ammo reliably, it needs a quality gas tube. This gas tube is compatible with all AR-type rifles and pistols configured with a carbine-length gas system. Use this instructional guide for installing your...

    Was: $14.39
    Now: $11.99
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    ar-15-fully-stripped-upper-receiver-1 ar-15-fully-stripped-upper-receiver-2 ar-15-fully-stripped-upper-receiver-3 ar-15-fully-stripped-upper-receiver-4 ar-15-fully-stripped-upper-receiver-5

    AR-15 Fully Stripped Upper Receiver

    This stripped upper receiver is made from 6061 T6 aluminum and conforms to all mil-spec measurements. Being the A3 type, it also features a "flat top." This means instead of the old-school carry handle that the A2 style used to have, you get a...

    Was: $69.59
    Now: $57.99
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    UTG® Quick Install Dust Cover -  .223/5.56,  Black UTG® Quick Install Dust Cover -  .223/5.56,  Black 2 UTG® Quick Install Dust Cover -  .223/5.56,  Black 3 UTG® Quick Install Dust Cover -  .223/5.56,  Black 4 UTG® Quick Install Dust Cover -  .223/5.56,  Black 5

    UTG® Quick Install Dust Cover - .223/5.56, Black

    Installing a dust cover onto your AR's upper receiver can be a major hassle. If you're starting with just individual parts, you need to snap the C-clamp onto the rod without launching the damned thing across the room and never seeing it again. Then you...

    Was: $11.99
    Now: $9.99
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Mil-spec, forged, stripped upper receivers for your custom AR build.

Ready to custom-build your first, or next upper? Grab one of our affordable, mil-spec stripped receivers. We work hard to keep prices low on every unit without sacrificing quality. Each stripped upper is manufactured in the USA and properly forged, cut, stamped and and threaded for easy assembly. We've also got the necessary components to install your new barrel.

What is a Stripped Upper Receiver?

M4 clones are cool, but the new low-profile gas block design is where you'll enjoy real performance. Coupled with a lightweight free-float handguard (which includes your barrel nut!), piecing together your upper receiver is easy and requires just basic gunsmithing tools. Our available gas blocks work with virtually any handguard or rail on the market, and each includes the necessary pins for seating it on your barrel.

Ready to assemble your upper, barrel, and handguard? Use our instructional guide!

Compatible with Virtually All Stripped Lowers

Our stripped uppers work with any standard AR-type lower receiver (that means any retail-bought stripped lower, or fabricated 80% lower) configured for the typical 5.56/.223 profile. That also means our upper receivers work with any builds chambered in 9mm, 300 Blackout, .224, 6.5 Grendel, and more

Don't Forget The Gunsmithing Tools!

Assembling your upper requires a torque wrench, barrel nut wrench or adapter, and some roll pin punches with the appropriate gunsmithing hammer. We've got all the tools required for completing your assembly, available right here.

Your custom upper awaits.


DISCLAIMER: If you are new to the world of DIY gun building, you likely have a lot of questions and rightfully so. It’s an area that has a lot of questions that, without the correct answers, could have some serious implications. At GunBuilders.com, we are by no means providing this content on our website to serve as legal advice or legal counsel. We encourage each and every builder to perform their own research around their respective State laws as well as educating themselves on the Federal laws. When performing your own research, please be sure that you are getting your information from a reliable source.

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.