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 JigsĀ® 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.

ColtĀ® Pattern Lowers

  • NEW!|#637e31
    A9X Ambidextrous AR-9 Stripped Lower ā€“ ColtĀ® Magazine Pattern
    Pre-Order Now

    A9X Ambidextrous AR-9 Stripped Lower ā€“ ColtĀ® Magazine Pattern

    $254.99
    $229.99
  • NEW!|#637e31
    A9X Ambidextrous AR-9 80 Lower ā€“ ColtĀ® Magazine Pattern - RAW
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    A9X Ambidextrous AR-9 80 Lower ā€“ ColtĀ® Magazine Pattern - RAW

    $154.99
    $129.99
  • NEW!|#637e31
    A9X Ambidextrous AR-9 80 Lower ā€“ ColtĀ® Magazine Pattern
    Pre-Order Now

    A9X Ambidextrous AR-9 80 Lower ā€“ ColtĀ® Magazine Pattern

    $224.99
    $199.99
  • BRN AR-15 Colt Style 9mm 32 Round Magazine
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    BRN AR-15 Colt Style 9mm 32 Round Magazine

    $39.99
  • Duramag Colt SMG 9mm 10rd Magazine
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    Duramag Colt SMG 9mm 10rd Magazine

    $29.90
  • Duramag Colt SMG 9mm 20rd Magazine
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    Duramag Colt SMG 9mm 20rd Magazine

    $29.90
  • Duramag Colt SMG 9mm 32rd Magazine
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    Duramag Colt SMG 9mm 32rd Magazine

    $29.90
  • Maglula Magazine Loader/Unloader 9MM Fits Colt SMG
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    Maglula Magazine Loader/Unloader 9MM Fits Colt SMG

    $31.95
    $28.75

Colt®-Pattern AR9 Lowers

If you’re building a 9mm AR around the classic straight-mag platform, you’re in the right place.

Our Colt®-pattern AR9 lowers are designed for builders who prefer the proven double-stack, double-feed magazine system originally used in the Colt®-style SMG platform. Known for consistent feeding and reliable performance, this magazine geometry remains a popular choice for serious PCC builders.

Modern Features, Classic Compatibility

While the original Colt®-style lowers were built decades ago, today’s builders expect more. That’s why our Colt®-pattern lowers are engineered with modern updates, including:

These lowers are designed for compatibility with Colt®-pattern 9mm magazines and components, while delivering the upgraded ergonomics and performance modern shooters expect.

Why Choose a Colt®-Pattern Lower?

Colt®-pattern AR9 builds remain popular for several reasons:

Whether you’re building a competition PCC, a range rifle, or a retro-inspired setup with modern upgrades, a Colt®-pattern lower offers a reliable foundation.

Built for Builders

At 80% Arms, we focus on precision machining, in-house manufacturing, and consistent supply. Our goal is simple: give builders a high-quality Colt®-pattern compatible lower without outdated features or inconsistent availability.

Browse our selection of Colt®-pattern AR9 lowers below and choose the configuration that fits your build.

 *Colt® is a trademark of Colt's Manufacturing Company LLC. Some components on our site are genuine Colt® OEM components, while other parts including our 80% lowers are aftermarket parts which are not produced by or endorsed by Colt's Manufacturing Company LLC. Aftermarket and OEM products are clearly marked to avoid confusion.

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