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.

Premium Upgrades

At 80% Arms, we strive to offer premium products that elevate the performance of our customers' firearms, and our GST-9 modular pistol frame is no exception. Our selection of high-quality accessories is specifically designed to enhance the GST-9 shooting experience. The Infinity Jig is a cutting-edge tool made from top-quality materials, including 6061 aluminum and stainless steel. It features a self-centering mechanism that guarantees precise and consistent machining results for customizations to the GST-9 frame. This modular jig allows users to switch between V1 and MOD1 frames with ease, making it an indispensable tool for those who enjoy customization and versatility.

Another premium accessory we offer for the GST-9 is our Billet Grips, made from high-quality billet aluminum. They offer a comfortable and secure grip and are available in a range of colors and finishes, so you can customize your GST-9 to match your personal style. In addition to their visual appeal, the Billet Grips are equipped with a flared magwell and are durable and long-lasting, ensuring reliability and consistent performance in all shooting conditions.

We are excited to introduce our customers to Smith Defense products, a leading manufacturer of high-quality firearms parts and accessories. Their commitment to quality and innovation aligns with our values at 80% Arms, making them a valuable addition to our product lineup. We are confident that our customers will appreciate the superior performance and durability of Smith Defense products.

At 80% Arms, we believe that our premium accessories, such as the Infinity Jig and Billet Grips, can take your GST-9 to the next level, whether you're a casual shooter or a professional. Our commitment to quality ensures that our customers receive products that are reliable, durable, and designed to enhance their shooting experience. So, if you're looking to upgrade your GST-9, look no further than 80% Arms for premium accessories that will deliver superior performance and functionality.