AR-15 Build 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 uppers with a variety of Cerakote finishes. READ MORE

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Other Other AR-15 Parts & Accessories:

Magpul Light Mount V-Block and Rings - MAG614All Other Products
AT3 SPEAR Furniture Kit with M-LOK Handguard, Magpul CTR Buttstock and MOE Pistol Grip FDE 12 InchAR 15 Furniture Kits
Wheeler AR Armorers Essentials Kit  - 156111AR-15 Cleaning Kit and Tools
AR-15 Conversion Kits .22 LR and More
UTG Heavy Duty Recon 360 Bipod - 3 Heights AvailableAR-15 Rifle Bipods
Magpul MS4 Dual Multi Mission Quick Detach Sling - MAG518AR-15 Slings & Mounts
AT3™ FF-ML 20 Inch 6.5 Grendel Complete Upper - 6.5 Grendel Type II 20 Inch Faxon Firearms Barrel - 15 Inch M-LOK Free Float HandguardAR-15 Upper: Complete Upper Assemblies
Pelican Protector 1700 Long Gun Case - 35.75in X 13.75in X 5.25inRifle Cases for AR-15
AR-15 Build Kits and Assemblies
AT3 Logo TeeAT3 Swag