AT3™ Slick Side Upper | Billet Upper Receiver for AR-15

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Breek Arms Warhammer Ambi Charging Handle


Breek Arms WARHAMMER Mod 2 Ambidextrous AR 15 Charging Handle

Tough, Sleek, and ready for the AT3 SPEAR M-LOK Handguard

Machined from billet aluminum, this unique slick-side upper receiver has no forward assist, includes a dust cover, and matches perfectly with AT3’s SPEAR handguards with anti-rotation features. This upper also features more material to surround your barrel extension than typical forged receivers, making it more ideal for precision. This lower matches up with mil-spec lower receivers for a secure, reliable fit.

The AT3 Slick Side Upper Receiver also comes in a wide variety of colors, ranging from classic black, Magpul-matching Flat Dark Earth, vivid Pink, and even new metallic shades like Tungsten, Titanium, and Burnt Bronze. Flat black uppers have classic hard-coat anodizing, while the other colors receive a durable Cerakote finish.


  • M4 Feedramps
  • .250 takedown pin holes
  • Low-profile brass deflector
  • Includes dust cover
  • No Forward Assist


  • MATERIAL: 6061-T6 billet aluminum
  • FINISH: Anodized Black, Magpul FDE Cerakote, Magpul Stealth Grey Cerakote, Magpul OD Green Cerakote, Prison Pink Cerakote, Burnt Bronze Cerakote, Titanium Cerakote, Tungsten Cerakote
  • COMPATIBILITY: Perfect match for AT3 SPEAR Handguards, standard AR15/M16 bolt carriers, charging handles, and some other handguards.
  • WEIGHT: 7.1 oz

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

Based on 111 reviews
Great piece

Had to leave another review to post pics.

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Tyler Hurst
Nice Piece

This thing is real slick. Love how it marries to the spear lock hand guard. Really impressed

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Steve Miller
Upper and Spear.

Picture says it all.

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Allen Harman
A True Slick Side Upper!

The past Three AR-15 style of Firearms that I have acquired have either been totally built from scratch by myself or I have purchased a completed Upper Assembly and built the Lower; I recently completed "No. 4" as a total build from scratch using the AT3 Slick Side Billet Upper Receiver that comes with the Ejection Port Cover already installed...

X-Products was finally offering a Parts Kit for assembling the Barrel portion of their Can Cannon at less than a third of the cost of purchasing a complete Can Cannon Upper - all I needed to do was supply my own blank AR-15 Upper Receiver. Seeing that the Can Cannon does not cycle the action, I didn't need an Upper Receiver with a Forward Bolt Assist or an M2 style Brass Deflector. But every Blank Upper out there that's not a First Generation AR-15 Upper (no Forward Bolt Assist or Brass Deflector) costs in excess of $150. However AT3 has one, with an Ejection Port cover already installed for less than $100 so I bought it!

The quality of the AT3 Tactical Slick Side Billet Upper Receiver with an Ejection Port cover is superb in every respect from the Mil-Spec construction to the perfect Black Anodized finish. And for the money I saved by building the X-Products Can Cannon myself, I was able to grab the perfect Accessory for it, the X-Fore Golf Ball Launcher Barrel that slips inside the Can Cannon Barrel and threads directly over the Gas Ejection Port so that my Golf Balls exit at more than 450 Feet per Second!

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I have 2

Great fit and finish.

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