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AT3 Tactical AR-15 Slick Side Billet Upper Receiver

AT3 Tactical AR-15 Slick Side Billet Upper Receiver


MSRP: $89.99


Out Of Stock

Lifetime WarrantyOn All AT3 Brand Products

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

This includes AT3 Red Dot Sights, Handguards, Iron 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.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

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. Matches with mil-spec lower receivers for a reliable fit. Made in the USA.


  • 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
  • COMPATIBILITY: Perfect match for AT3 SPEAR Handguards, standard AR15/M16 bolt carriers, charging handles, and some other handguards.
  • WEIGHT: 7.1 oz

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Customer Reviews

Based on 7 reviews

I like the smooth transition from upper receiver to vanguard, very good quality.

Thanks for sharing your feedback, Arnold. We're glad you're satisfied with your purchase. Cheers! - AB
Billet Upper

Just purchased this upper because I wanted to have the matching set and I couldn’t be more pleased. The quality of workmanship is great and I would recommend this to anyone looking to build an AR. Oh yeah, shipping is super fast. Thanks AT3 for your service.

Thanks for sharing your feedback, Timothy. We're glad you're satisfied with your purchase. - AB
Awesome Upper

I own this upper with the matching handguard. Fit and finish are excellent and it is very light weight. Will buy again!

Thanks for sharing your feedback, Ken. We're glad you're satisfied with your purchase. Cheers! - AB
Nice reciver

Bought the Spear handguard and the fit and finish were Fantastic. Then my build didnt look complete so I got the reciver to match. Perfect fit. Looks great !

Thanks for sharing your feedback, Mark. We work hard to meet expectations like yours, we're glad we hit the mark for you. - AB

I really like the slim profile. I’ve never used a forward assist so I figured I didn’t need one. I’m a big fan of this upper matched with the AT3 Spear handguard. My only regret is that I found this company after I had already bought other parts for my build. Extremely fast shipping is a big plus too!

Thanks for the feedback, Matt! We're glad you found us and that you're satisfied with the experience thus far. -- LM