cc-settings-icon BUILD AT HOME
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.

GST-9: 80% Pistol Build Kit - V1

GST9 Color Option
Full Size Grip Color Option
Calculated at Checkout
Fast Shipping:
Norton Shopping Guarantee


We received permission from the Federal Court to sell this item. State Restrictions apply. READ MORE.

In case you weren't able to get your hands on the first version of the GST-9 frame, now's your chance! The Legacy Frame is back up for grabs in the V1 Build Kit package which includes the original GST-9 frame, the compact and large grip modules, a completed Wraith Slide, and a G19 Lower Parts Kit. 

This package is a steal as you're not only getting the best 80% Glock-style pistol frame with the most amount of factory provided 'aftermarket features' but the lower parts kit also includes our very own aluminum curved G19 trigger and an extended slide lock release lever for enhanced ergonomics. Hit the ground running with this build kit jam packed with features!

Please Note:

*V1 GST-9 Jigs are also different from MOD1 Jigs due to some slight differences in the frame and the updated rails. V1 GST-9 Jigs must be added to your cart separately but can still be purchased together with the V1 Build Kit in the same order. 

Find out all the ways you can build out your next GST-9! 

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


The complete GST-9 pistol kit is everything you need to build a top-tier handgun, at a production level price. Engineered from the ground up to capitalize on all the strengths of the Generation 1-3 Glock® platform, while also incorporating the most common aftermarket upgrades as standard features, we've created a pistol that not only ships straight to your door, but outshoots you everyday of the week. 

Every GST-9 Pistol comes with:

Our products are always backed by our Lifetime Warranty!

Due to 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.

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

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.