GST-9: MOD1, Pistol Frame

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Released in November 2019, the original GST-9 took the 80% world by storm, offering modular enhancements to a Glock style frame without losing any parts compatibility. Two years and hundreds of thousands of rounds downrange later, we've raised the bar again with the GST-9 MOD1.

What makes the GST-9 MOD1 version so special? 

  • Modular frame gives you the possibility of a 19, 19X, 19L, & 17 size weapon system in a single 4-in-1 platform
  • Compatible with Glock 19 3rd generation parts, holsters, & aftermarket accessories. GST-9 is the first and only 80% lower that is compatible with Glock holsters
  • Ergonomic features include an undercut trigger guard, high beavertail, glove bevel, scalloped mag release, no finger grooves, & newly redesigned gas pedals as standard
  • Premium internal rail components extended 3X, made of stainless steel, with multiple coating options
  • Easily ships to your door & completes in minutes

With two years of feedback from our customers, we made a few changes to our GST-9 frame to stay ahead of the competition. First, we relocated the gas pedals forward, and re-contoured them to further optimize control over the frame through the recoil cycle, helping to drive the gun back to target faster and more efficiently. We also re-contoured our modular grip attachment surfaces so that every grip option gives you a perfect fit, for the cleanest build possible. Internally, we separated the rear-rail module to improve the builder's experience, with users now only needing to line up one hole at a time, further simplifying the build process. 

The GST-9 MOD1 is built from the ground up to be reliable, customizable, and  accurate. It's the most functional and user-customizable 80% Glock compatible frame on the market. And, like all of our products, it is backed by our Lifetime Warranty and our premium customer support. Every MOD1 Frame comes with a Compact Grip Module in the selected frames color. 


How easy is it to build? Check out the instruction manual and see for yourself! 

*The GST-9 does NOT accept Glock 17 slides. The GST-9 frame accepts Glock 19, Glock 19L, & Glock 19XL slides* 

Due to recently changed ATF regulations, we cannot legally include the jig or frame rails with the GST-9 frame. The jig and GST-9 frame must be purchased on our website as two separate items. Each jig includes one set of GST-9 frame rails. You will need to purchase one jig for every GST-9 frame you plan to build. Frame rails are ONLY included with the jig, not with the 80% lower itself. Shipping Restrictions: This item is restricted from shipping to New Jersey, Hawaii, Connecticut, San Diego County, Rhode Island and Washington D.C.

Because the GST-9 is not a firearm, in most cases, it is currently legal to purchase and own an unfinished frame in California. California law prohibits building an off-roster handgun as well as a home built firearm that does not contain an integral 3.7 oz piece of 17-4 stainless steel. If you are purchasing a GST-9 that ships to California, you certify that you have a law-enforcement exemption, or intend to build and maintain the product outside of the state.