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

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Magpul BEV Block - AR-15 Vise Block Tool - MAG536

Magpul BEV Block - AR-15 Vise Block Tool


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


  • Platform: AR15
  • Material: 6061-T6 billet aluminum
  • Finish
    • Black: Type III Hardcoat Anodized
    • Flat Dark Earth: H-267 Magpul® Flat Dark Earth
    • OD Green: H-232 Magpul® OD Green
    • Gray: H-188 Magpul® Stealth Grey
    • Pink: H-224 SIG™ Pink
    • Burnt Bronze: H-148 Burnt Bronze
    • Tungsten: H-237 Tungsten
    • Titanium: H-170 Titanium
  • Compatibility: Perfect match for AT3 SPEAR Handguards, standard AR15/M16 bolt carriers, charging handles, and some other handguards.
  • Weight: 7.1 oz

Note: Not compatible with Wheeler Delta Series Upper Vise Block. We suggest to use the Magpul Bev Block

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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 122 reviews
Keith Daymond
Awesome Build

Purchased this upper and other titanium parts from AT3 looks amazing just waiting on the titanium stock to come back in. used a black one for now. waiting on the barrel to get here then this 224 will be ready to shoot and be a head turner at the range. matched up with the AT3 handguard and it does not get much sleeker than this.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Excellent fit & styling

Top quality upper by AT3, nice to have house brand products of such quality. Finish, styling and color is excellent and styling is what's missing from so many other brands. The styling is perfect with AT3's matching rails and lowers and even other brands. Here's a pic of 3 different brand components yet they fit so well.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Kevin Barreto

Love it looks great 👍🏽

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Great piece

Had to leave another review to post pics.

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.

Tyler Hurst
Nice Piece

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

Thanks for sharing your feedback! We're glad you're satisfied with your purchase.