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The GST-9 is the innovative new 80% Pistol frame from 80% Arms. What separates the GST-9 from other options on the market?
  • Modular frame gives you a 19, 19X, 19L, and 17 weapon system in a single 4-in-1 platform

  • Compatible with Glock 3rd generation parts, existing holsters, and aftermarket accessories

  • Ergonomic features include a single undercut, high beavertail, glove bevel, scalloped mag release, no finger grooves, and gas pedals as standard

  • Premium internal rail components extended 3X, made of stainless steel, and nickel-plated

Price: $149.99

Availability: Back Order
Product Code:

Frame Color*:
Flat Dark Earth


For current lead times of this product and others please visit our production blog: Click Here

Developed by
80% Arms:

The GST-9 is the world’s first truly modular 80% pistol frame system compatible with Gen 1-3 Glock® 19 platform components and Glock® holsters. Patent-pending modular grips allow for easy conversion between compact and full size allowing for the use of both Glock® 19 and Glock® 17 magazines. Ergonomics have been improved by designing a contoured grip that improves comfort and helps tame recoil. An undercut trigger guard gives you a higher grip on the frame, thus lowering the bore-axis and reducing muzzle flip for faster, more accurate follow-up shots.

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 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 a dramatically improved 80% Glock® parts compatible pistol frame design, but it’s also the easiest 80% pistol to build. The GST-9 jig uses a much stronger clamping mechanism, significantly beefed up drill guides, and a glass-filled polymer material that is 3x stronger than the plastic used in every other polymer lower jig. This decreases lower completion time, lowers the chances of messing up your build, and results in a much more precise finished lower. You can expect to complete your GST-9 build in only about 10 minutes.

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 the 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.

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

Shipping Restrictions: This item is restricted from shipping to New Jersey, Hawaii, Connecticut, 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 homebuilt firearm that does not contain an integral 3.7 oz piece of 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.