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19 of 19 Items
19 of 19 Items

Barreled AR upper assemblies for custom AR-15 rifles.

Regardless of platform, each of our AR-15 rifle upper assemblies is meticulously crafted and configured to be mil-spec and compatible with all components for its caliber. Whether piecing together a custom AR-15 in 5.56/.223, 300 Blackout, or 6.5 Grendel, you can be confident behind the trigger knowing you're getting a unit built for dependability and accuracy.

Why Our AR-15 Rifle Uppers?

All rifle uppers are assembled and test-fired to ensure reliability before shipping. Unless selecting an A2-style upper with classic FSB, all uppers utilize a low-profile gas block to ensure compatibility with any free-float handguard. To purchase all components required for assembling a working rifle, pair your upper with a lower parts kit assembly (includes mil-spec 80% lower).

  • All barrels are forged from MIL-B-11595 E steel (4150 or Chromoly Vanadium)
  • All stainless barrels forged from Crucible 416R steel, offering sub-MOA accuracy
  • All BCGs are M16 in profile with chrome lining and properly staked gas keys
  • All stripped upper receivers forged from mil-spec 7075 T6 aluminum
  • All buffer assemblies and lower parts kits are mil-spec in fit and finish
  • All barreled uppers are test-fired to ensure proper assembly

Can't decide between carbon and stainless? Read the Guide to AR-15 Barrels.

AR Upper: What's Included

  • 4150 CMV or 416R barrel
  • Preinstalled gas block and gas tube
  • M16/full-auto staked, chrome-lined BCG
  • Mil-spec aluminum charging handle
  • A2, M-Lok, or Keymod handguard
  • Chrome-lined or Nitride chamber w/ M4 ramps
  • A2 flash hider or custom muzzle device

Completing Your Build: Federal and State Laws

Some states have banned the sale of upper assemblies, receivers, 80% lowers, and certain firearm parts, or have otherwise restricted the sale and ownership of products we sell. So, be sure to check your local and state laws. We can’t ship our products to certain states. Please check our Shipping & Return Policy before placing an order (see restrictions).

Your build awaits you.


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 80-lower.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.