Product Code: 38019-JIG

GST-9: MOD1, Jig w/ Tool Kit & Slide Rails

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Questions on how ATF rule affects these products? View ATF Rule Directory

80% Arms hasn't just made the most advanced 80% pistol frame and jig combo on the market, they're made sure that using it is completely foolproof. The GST-9 MOD1 jig is so simple, you can complete your frame in minutes with the best results in a polymer 80% Glock compatible pistol frame yet.


Every jig comes with a set of frame rails and all the tools you need to complete your MOD1 frame at home. There's a detailed instrruction manual to walk you through the simple process as well. For your rails, builders have the options of choosing either Nickel Boron or Black Nitride coated rails. 




NOTE: The jig is not included in the build kit. It must be purchased separately.


The MOD1 does NOT accept GLock 17 slides. The frame only accepts Glock 19 and Glock19L slides. Purchase of any MOD1 includes one compact grip module in the same color as the selected frame. No substitutions are possible.


Due to a change in ATF regulations, we cannot legally include the jig or frame rails with the GST-9 MOD1 frame. The jig and 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 MOD1 frame you plan to build. Frame rails are ONLY included with the jig, not with the 80% pistol frame itself. 


Because the GST-9 MOD1 is not a firearm, in most cases it's 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 stainless steel. If you are purchasing a GST-9 MOD 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. 



  • Over-engineered jig made out of glass-filled polymer (3x stronger than any other jig on the market)
  • Drill guides protrude .250" from the surface to provide significantly more support for a drill bit compared to any other pistol jig on the market. 
  • Builders should never experience drill bit walk or a flexing jig
  • Includes six bolts to keep jig halves tightly sealed together for best tolerances and results

Shipping Restrictions: This item is restricted from shipping to New Jersey, New York, Hawaii, Connecticut, Rhode Island, Washington D.C., Maryland, Illinois, California, Washington, Allenspark Colorado , Coal Creek Canyon Colorado , Eldora Colorado , Eldorado Springs Colorado , Gold Hill Colorado , Gunbarrel Colorado , Hygiene Colorado , and Niwot Colorado, and Denver Colorado.