AR-15 Kits and Assemblies

Build Your Next Custom AR-15 with Quality Kits and Complete Assemblies

Find the right lower parts kits, upper receiver assemblies, and even complete rifle kits to make your next build truly your own! AT3 offers discounted bundles for gun builders, from lower parts kits with matching grips and stocks, to complete READ MORE

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AT3 Tactical AT-15 M-LOK Builder Set - Lower, Upper, and SPEAR M-LOK Handguard

(9)

AT3™ AT-15 M-LOK Builder Set – Anodized and Cerakote

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(1)

AT3™ AT-15 Lower and Upper Receiver Set – Anodized and Cerakote

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AT3 Tactical AT-15 Quad Rail Builder Set - Lower, Upper, and Pro Quad Rail Handguard

(6)

AT3™ AT-15 Quad Rail Builder Set – Anodized and Cerakote

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"Backseat" CQB .300 Blackout 7.5" AR-15 Pistol - Team Dream Build

“Backseat” CQB .300 Blackout 7.5″ AR-15 Pistol – Team Dream Build

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"Rucksack" Compact 9mm 8.3" AR-9 Pistol - Team Dream Build

“Rucksack” Compact 9mm 8.3″ AR-9 Pistol – Team Dream Build

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"Hush" Suppressor-Ready 5.56 11.5" AR-15 - Team Dream Build

“Hush” Suppressor-Ready 5.56 11.5″ AR-15 – Team Dream Build

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"Striker" 5.56 NATO 16" AR-15 Carbine - Team Dream Build

“Striker” 5.56 NATO 16″ AR-15 Carbine – Team Dream Build

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"Watchman" .223 Wylde 18" AR-15 DMR - Team Dream Build

“Watchman” .223 Wylde 18″ AR-15 DMR – Team Dream Build

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"Carlos" Compact AR-9 PCC Kit - Team Dream Build

“Carlos” Compact AR-9 PCC Kit – Team Dream Build

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"Perkins" Walnut .350 Legend AR-15 Kit - Team Dream Build

“Perkins” Walnut .350 Legend AR-15 Kit – Team Dream Build

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"Sunset" .300 Blackout Carbine Kit - Team Dream Build

“Sunset” .300 Blackout Carbine Kit – Team Dream Build

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1000 Yard 6 ARC Gas Gun Dream Build Kit - June Giveaway

1000 Yard 6 ARC Gas Gun Kit – June Dream Build

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A1 Retro AR15 Clone with A3 Modern Sporting Rifle - Luth AR AT3 Tactical

Luth-AR Retro Meets Modern Memorial A1 and A3 AR-15 Dream Builds

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AT3 Pro-Builder AR-15 Lower Build Kit

(1)

AT3™ Pro-Builder™ Black AR-15 Lower Build Kit

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October Freedom Fighter Title V2 - 1200x1200

Freedom Fighter ODG/FDE Complete 5.56 Rifle Build Kit – October Dream Build

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April Dream Gun - FN 509 Ultimate Duty Carry Pistol Kit

Ultimate FN 509 9mm Duty Carry Package – April Dream Build

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AT3™ 22LR 4.5" Barrel Kit - 4.5" Tapered 22LR Barrel - Dedicated 22LR BCG - 25rd Black Dog 22LR Magazine

AT3™ 22LR 4.5″ Barrel Kit – 4.5″ Tapered 22LR Barrel – Dedicated 22LR BCG – 25rd Black Dog 22LR Magazine

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AT3™ 22LR 16″ Assembled Upper – 2A Basics ASAL 15" Handguard – with BCG/Charging Handle

AT3™ 22LR 16″ Assembled Upper – 2A Basics ASAL 15″ Handguard – with BCG/Charging Handle

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AT3™ 22LR 16" Barrel Kit - 16" Pencil 22LR Barrel - Dedicated 22LR BCG - 25rd Black Dog 22LR Magazine

AT3™ 22LR 16″ Barrel Kit – 16″ Pencil 22LR Barrel – Dedicated 22LR BCG – 25rd Black Dog 22LR Magazine

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AT3 Tactical March 2026 Giveaway Gun - 3-Gun Rifle Kit

3-Gun Rifle Complete Build Kit – March Dream Build

DAILY DEAL

AT3™ 22LR 16″ Assembled Upper – 2A Basics ASAL 15" Handguard – with BCG/Charging Handle/Magazine

AT3™ 22LR 16″ Assembled Upper – 2A Basics ASAL 15″ Handguard – with BCG/Charging Handle/Magazine

Save 15%

Magpul MOE M-LOK Furniture Kit - Stock, Carbine Handguard & Grip

(334)

Magpul MOE M-LOK AR-15 Furniture Kit – Stock, Carbine Handguard & Grip

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AT3 AR-15 Billet Upper and M-LOK Handguard with Cerakote Finishes - 7 Colors

(160)

AT3™ AR-15 Upper Receiver and SPEAR Handguard Combo

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(121)

AT3™ Pro-Builder™ AR-15 Lower Parts Kit – No Grip or Trigger Assembly

Build Your Next Custom AR-15 with Quality Kits and Complete Assemblies

Find the right lower parts kits, upper receiver assemblies, and even complete rifle kits to make your next build truly your own! AT3 offers discounted bundles for gun builders, from lower parts kits with matching grips and stocks, to complete uppers with a variety of Cerakote finishes.

First time builder? We’ve curated some handy videos to help you put together your own AR-15 rifle, or upgrade one you already have. We also offer complete lower receivers that can be transferred to your local gun shop.