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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.
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.
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.
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.
​80 Percent Arms Proudly Announces GST-9 Infinity Jig thumbnail image

​80 Percent Arms Proudly Announces GST-9 Infinity Jig

80 Percent Arms   |   Mar 24th 2023


Fort Worth, TX (MARCH 24TH, 2023) — 80 Percent Arms, the nation's premier manufacturer of 80% jigs, lower receivers and the GST-9 MOD1 polymer pistol frame, is once again pushing the envelope in enabling Americans to build high quality firearms in the convenience and privacy of their own homes and proudly announces the launch of the GST-9 Infinity Jig — the first reusable 80 percent jig for polymer pistol frames. This jig is designed with durability to outlast the ATF!

- See Odysee Video Link Here - Constructed from high-grade billet aluminum and heat treat hardened steel bushings, the GST-9 Infinity Jig ensures long-lasting use and extreme durability against wear out over the maximized lifespan of your jig. The premium build quality of this jig increases hole alignment when drilling your frame(s). It’s an excellent choice for those who require a reliable and repeatable jig to make multiple builds.

The new GST-9 Infinity Jig's precision-milled flat surfaces on both sides make it easy to secure and maintain level when drilling into a GST-9 frame. With this new jig profile, builders can confidently drill and mill in stride.

Both variations of GST-9 frames, the Mod 1 and Legacy (V1) frames, will work perfectly with the Infinity Jig. Users can take advantage of the jig’s backwards compatibility to finish any GST-9 frames they’ve stored for future builds, reducing the need to purchase multiple polymer jigs.

GST-9 Infinity Jig and MOD1 Frames

With only three simple parts and two screws, assembling your new Infinity Jig is effortless. This feature ensures that customers can use the jig without having to spend a lot of time setting it up or worrying about losing parts of the jig.

Black nitrided CNC rails will come standard with the GST-9 Infinity Jig which provides an extra durable surface layer that enhances the quality and life of your rail components with increased abrasion and corrosion resistance - not to mention the lubricity for extra smooth slide action.

GST-9 CNC Front Rail

As always, the GST-9 Infinity Jig is centered around YOU. No two missions or two shooters are the same. That’s why 80% Arms designed a jig for users to be able to build out as many GST-9’s as they need to tailor each build to their specific needs or purposes.

The GST-9 Infinity Jig is immediately available online for purchase and ships directly to your door.