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AT3™ AT-15 SPEAR XL Billet Builder Set – Anodized and Cerakote

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This item is regulated, therefore your entire order will be shipped to an FFL dealer of your choosing. After you place your order, we will contact you to finalize these details.

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AT3™ AT-15 SPEAR XL Billet Builder Set

Transform your AR build with the suppressor-ready AT3 SPEAR XL Builder Set. This complete kit pairs our billet upper receiver with the SPEAR XL M-LOK handguard system, featuring a generous 1.74″ internal diameter that accommodates most suppressors while maintaining full M-LOK compatibility.

The 6061-T6 aluminum construction and steel barrel nut provide rock-solid durability while keeping weight to a minimum. Choose between 12″ and 15″ lengths to match your build requirements, with finishes available in classic black anodized, FDE, or ODG Cerakote to perfectly match your other AT3 components.

To get your rifle together, start with a lower parts kit, a buffer kit, a barrel of your choice, bolt carrier group, and charging handle. And as always, the pistol grip and stock that fits you best. If you’re looking for an even more robust, quad rail handguard, check out the AT-15 Quad Rail Builder Set. If you’re looking for more specific building needs, you can always choose a Stripped AT-15 Lower, or AT-15 Lower and Upper Set.

AT3™ AT-15 SPEAR XL Billet Builder Set - Anodized and Cerakote

Durable Construction and Finishes

  • Forged 6061-T6 billet aluminum construction for tried-and-true toughness that won’t let you down
  • Cerakote in FDE, ODG, or a classic black anodized finish resist scratching and wear over time
  • Rigid 7075-T6 aluminum barrel nut provides the support your handguard needs for maintaining zero

Customizable with Cerakote

  • Compatible with all mil-spec AR-15 components and numerous upgrades like triggers, pistol grips, safety selectors, and more
  • Color coordinate your builds with AT3 parts – we use the same Cerakote colors for all finishes we offer on all AR parts
  • Attach accessories using the M-LOK system at 3, 6, and 9 o’clock position, plus a full length picatinny top rail!

Available Finishes

  • Black: Type 3 Hardcoat Anodized
  • Flat Dark Earth: H-267 Magpul® Flat Dark Earth
  • OD Green: H-232 Magpul® OD Green

 

What’s Included

Specifications

  • Lower Receiver
    • Platform: AR-15
    • Material: Forged 7075-T6 Aluminum
    • Markings: “Cal Multi”, Pictogram Safety
    • Compatibility: Works with standard AR15 components and magazines
    • Weight: 8.35oz
  • Upper Receiver
    • Material: 6061-T6 billet aluminum
    • Weight: 7.1 oz
    • Feedramps: M4 Feedramps
  • Handguard
    • Handguard Material: 6061-T6 Aluminum
    • Handguard inside diameter: 1.35”
    • Barrel Nut Material: 7075-T6 Aluminum
    • Barrel nut inside diameter: 1.02” (compatible with barrels up to 1” diameter)
    • Weight
      • 9″ Handguard – 9.9 oz
      • 12″ Handguard – 10.9 oz
      • 15″ Handguard – 11.9 oz
  • Trigger Guard
    • Material: 6061-T6 Aluminum

FAQ

Is this lower Mil-Spec?

The AT-15 uses 7075-T6 aluminum construction, and is available in a type 3 hardcoat anodized finish, which are mil-spec. The AT-15 also accepts all mil-spec AR-15 components. Most triggers, pistol grips, lower parts, buffer tubes, and upper receivers will have no issue fitting into this receiver. With the Cerakote options, the thickness of finish in some areas may make the fit a bit tighter.

What is Cerakote?

Cerakote is a ceramic paint and adheres to polymer and metal very well. Since the the lowers are painted, some wear marks may be seen on areas of heavy use. AT3 doesn’t warranty against Cerakote inconsistencies or the wearing of coatings. Our parts are Cerakoted using the official Cerakote colors.

Products available on this page:

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.

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