Skip to main content
cc-settings-icon BUILD AT HOME
80% Arms sells AR-15 and .308 80% Lower Receivers, 80% Lower Jigs and other accessories which allow you to legally build a firearm at home in most states.
cc-gun-icon INCREDIBLY PRECISE
We utilize state of the art 5-axis CNC machines to mill all our .308 and AR-15 80 percent lower receivers to incredibly precise tolerances using premium billet aluminum.
cc-hand-icon RIDICULOUSLY EASY
We also offer our patented AR-15 and .308 Easy Jigs® which is the first 80% lower jig that makes it ridiculously easy for a non-machinist to finish their 80% lower.
cc-thumbs-icon 100% SATISFACTION GUARANTEED
Products manufactured by 80% Arms carry a lifetime warranty against manufacturing defects. We will promptly replace or repair any product that we determine to be defective.

Gun Build Kits

  • GST-9: NOG100 - Holiday Exclusive - Completed
    Choose Options

    GST-9: NOG100 - Holiday Exclusive - Completed

    $709.96
    $589.97
  • GST-9: Mod100 - Black - Completed
    Choose Options

    GST-9: Mod100 - Black - Completed

    $709.96
    $589.97
  • Aero Precision Complete 16" AR-9 80% Build Kit
    Add to Cart The item has been added

    Aero Precision Complete 16" AR-9 80% Build Kit

    $989.99
  • KAK 16" 9mm 13" MLOK Upper AR9 80% Build Kit
    Add to Cart The item has been added

    KAK 16" 9mm 13" MLOK Upper AR9 80% Build Kit

    $740.91
  • KAK 4" 9mm 5.5" MLOK Upper AR9 80% Build Kit
    Add to Cart The item has been added

    KAK 4" 9mm 5.5" MLOK Upper AR9 80% Build Kit

    $759.91
  • KAK 8" 9mm 7.2" MLOK Upper AR9 80% Build Kit
    Add to Cart The item has been added

    KAK 8" 9mm 7.2" MLOK Upper AR9 80% Build Kit

    $781.91
  • KAK 8" 9mm 9" MLOK Upper AR9 80% Build Kit
    Add to Cart The item has been added

    KAK 8" 9mm 9" MLOK Upper AR9 80% Build Kit

    $793.91
  • KAK 11" 9mm 9.8" MLOK Upper AR9 80% Build Kit
    Add to Cart The item has been added

    KAK 11" 9mm 9.8" MLOK Upper AR9 80% Build Kit

    $802.91
  • DPMS 10.5" 556 Quad-Rail Upper AR-15 80% Build Kit
    Add to Cart The item has been added

    DPMS 10.5" 556 Quad-Rail Upper AR-15 80% Build Kit

    $680.46
  • DPMS 7.5" 300AAC Blackout M-Lok Upper AR-15 80% Build Kit
    Add to Cart The item has been added

    DPMS 7.5" 300AAC Blackout M-Lok Upper AR-15 80% Build Kit

    $700.12
  • DPMS 7.5" 300AAC Blackout Quad-Rail Upper AR-15 80% Build Kit
    Add to Cart The item has been added

    DPMS 7.5" 300AAC Blackout Quad-Rail Upper AR-15 80% Build Kit

    $700.12
  • DPMS 10.5" 300AAC Blackout Quad-Rail Upper AR-15 80% Build Kit
    Add to Cart The item has been added

    DPMS 10.5" 300AAC Blackout Quad-Rail Upper AR-15 80% Build Kit

    $678.52
  • Buffer Tube Kit Bundle
    Choose Options

    Buffer Tube Kit Bundle

    $204.99
  • Everything But The Upper Package
    Add to Cart The item has been added

    Everything But The Upper Package

    $270.63
    $264.99
  • DPMS Complete 16" 5.56 M-lok AR-15 100% Build Kit - Texas Edition
    Choose Options

    DPMS Complete 16" 5.56 M-lok AR-15 100% Build Kit - Texas Edition

    $707.76
  • DPMS Complete 16" 5.56 M-lok AR-15 100% Build Kit - Ambi Edition
    Choose Options

    DPMS Complete 16" 5.56 M-lok AR-15 100% Build Kit - Ambi Edition

    $724.15
  • DPMS Complete 16" 5.56 Quad-Rail AR-15 100% Build Kit - Texas Edition
    Choose Options

    DPMS Complete 16" 5.56 Quad-Rail AR-15 100% Build Kit - Texas Edition

    $686.77
  • DPMS Complete 16" 5.56 Quad-Rail AR-15 80% Build Kit
    Add to Cart The item has been added

    DPMS Complete 16" 5.56 Quad-Rail AR-15 80% Build Kit

    $598.16
  • Radical Firearms Complete 16" AR-15 80% Build Kit
    Add to Cart The item has been added

    Radical Firearms Complete 16" AR-15 80% Build Kit

    $799.99
  • Aero Precision Complete 16" AR-15 80% Build Kit
    Add to Cart The item has been added

    Aero Precision Complete 16" AR-15 80% Build Kit

    $1,149.99
  • OUT OF STOCK
    Aero Precision Complete 18" AR .308 80% Build Kit
    SOLD OUT

    Aero Precision Complete 18" AR .308 80% Build Kit

    $1,226.99
  • OUT OF STOCK
    Complete 16" .223/5.56/300BLK AR-15 80% Build Kit
    SOLD OUT

    Complete 16" .223/5.56/300BLK AR-15 80% Build Kit

    $710.99 - $748.98
  • OUT OF STOCK
    Complete 16" 7.62X39 AR-15 80% Build Kit
    SOLD OUT

    Complete 16" 7.62X39 AR-15 80% Build Kit

    $611.99 - $724.98
  • OUT OF STOCK
    ar9 build kit
    SOLD OUT

    Complete 16" AR-9 80% Build Kit

    $839.99 - $874.98
  • OUT OF STOCK
    Complete 18" AR .308 80% Build Kit
    SOLD OUT

    Complete 18" AR .308 80% Build Kit

    $995.99
  • OUT OF STOCK
    LDF Build Kit - Color Me GST-9
    SOLD OUT

    LDF Build Kit - Color Me GST-9

    $949.99
  • OUT OF STOCK
    Complete 10.5" 5.56/300BLK AR-15 Pistol 80% Build Kit
    SOLD OUT

    Complete 10.5" 5.56/300BLK AR-15 Pistol 80% Build Kit

    $635.99 - $678.97

Build Your Own AR with Our 80% Lower Rifle Build Kits

If you’ve ever wanted to build your own AR from the ground up, our 80% lower build kits are the ultimate solution. These 80% build kits include everything you need to assemble a fully custom AR15, AR10, or AR9 pattern rifle. Our kits are designed for builders who want hands-on experience, ultimate customization, and the satisfaction of creating a firearm that’s truly their own.

What Is Included in an 80% Build Kit?

Every rifle build kit includes all the components to complete your AR project, with the exception of a fully milled lower receiver. Our 80% lowers are unfinished and require milling to become a serialized, functioning firearm—keeping you in full control of your build.

Available Options

Why Choose Our 80% Lower Build Kits?

Whether you’re a first-time builder or a seasoned enthusiast, our 80% lower build kits give you the freedom to create your AR with confidence.

Shop our 80% Build Kits today and start your custom AR project!

Need some more info on if a build kit is right for you? Check out our blog!

All products backed by our lifetime guarantee!

!