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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.
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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.
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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 in under 1 hour with no drill press required.
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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.

S365 Modular Grip Extensions

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S365 Modular Grip Extensions
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S365 Grip Extensions are billet aluminum modular components designed to complete and customize your S365 grip build. Each grip ships with the Standard Extension and Dust Cover by default, but depending on your preferences, whether you're building for more control, a longer slide, or a specific carry style, you may need a different extension and dust cover to complete your ideal setup.

These extensions are precision-machined to fit seamlessly with all S365 frames. No guesswork, just a secure lockup with the included screws.

What You Need for Each S365 Size:

  • Standard P365:
    Grip Extension: Standard
    Dust Cover: Standard
    Grip Panels: Standard

  • P365X:
    Grip Extension: X
    Dust Cover: Standard
    Grip Panels: Standard

  • P365XL:
    Grip Extension: XL
    Dust Cover: Long
    Grip Panels: Long

  • P365L:
    Grip Extension: Standard
    Dust Cover: Long
    Grip Panels: Long

  • P365 Macro:
    Grip Extension: Macro
    Dust Cover: Long
    Grip Panels: Long

Whether you prefer a balanced carry setup, a compact build, a full-size frame, or anything in between, these extensions let you dial in your grip exactly how you want it. CNC-machined in the United States from the same billet aluminum as your S365 grip for a seamless fit and finish.