80% Arms dropped the GST-9 80% lower.


What makes the GST-9 so special?

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

The GST-9 is the world’s first truly modular polymer 80% pistol frame system compatible with Glock® 19 Gen 1-3 platform components. Patent-pending modular grips allow for easy conversion between compact and full-size frames. Ergonomics have been improved by designing a contoured grip that improves comfort and allows you superior control. An undercut trigger guard gives you a higher grip on the frame, lowering the bore-axis and reducing muzzle flip for faster, more accurate follow-up shots. A compact grip module is included with each frame, with full-size and competition modules also available! 

The GST-9 features several functional improvements over the time-tested Glock® platform, starting with the mating surface between the slide and frame. Frame rails have been extended three times their normal length for more repeatability, better accuracy, and controlled recoil impulse. Nickel-Boron plating improves reliability by reducing friction between moving parts in the harshest conditions, even after liquid lubricants have long since cooked off.

Not only is the GST-9 the most effective 80% pistol yet, it’s also the easiest polymer eighty percent pistol to build. We drew upon our expertise as the world leader in jig design to solve the shortcomings of other jigs on the market. Using a five-point clamping mechanism, significantly beefed up drill guides, and a body made of 3x stronger glass-filled polymer, it’s the easiest and most precise pistol jig ever. All of this means that you aren’t just getting the best 80% polymer, Glock-compatible frame on the market, but you can finish it in minutes.

The GST-9 Frame includes one compact grip module, in the same color as the frame. No substitutions are possible.

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.

As always, every product is backed by our Lifetime Warranty, and our premium customer support. 

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 slides* 


Please enter your comment!
Please enter your name here