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.
cc-gun-icon INCREDIBLY PRECISE
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.
cc-hand-icon RIDICULOUSLY EASY
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.
cc-thumbs-icon 100% SATISFACTION GUARANTEED
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

Introducing... The GST-9 

Introducing the GST-9, the world's first modular polymer 80% pistol compatible with Generation 1-3 Glock® components and both Glock® 17 and Glock® 19 magazines. Engineered from the inside out to improve upon the original Glock® design, the GST-9 frame is packed with features not found anywhere else. We spent two years studying customer feedback to determine what features were missing among the different options, and not only incorporated what we found, but we gave you the option to choose how to build each frame. 

Extended Internal Rails Exaggerated Gas Pedal Cuts
Nickel Mating Surfaces Trigger Guard Undercut
Compatible With Glock® Parts Full 1913 Picatinny Rail
Modular frame w/ Interchangeable Grip Sizing & Magwells   


GST-9 offers multiple grip modules for both a standard and a full-size frame that quickly attach to the contoured frame for improved ergonomics and shootability. Flared magwells speed up reload times, and our ultra-slick nickel-coated rails which are three-times original OEM length keep tolerances tight and recoil managed for quick, precise shooting. Why settle for a pistol made for someone else's hands? 

5.0 star rating 10/28/20
Easy Build. Great manufacturing receiver jig.
Product image for GST-9 Pistol Frame V1
GST-9 Pistol Frame V1
Easy build.
The fire control and other jig drilled holes were a perfect fit. I used Glock OEM parts for the slide and receive...
Read More
Tony G.
5.0 star rating 11/03/20
GST-9
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
WOW! I have waited for months and finally received my order today. It went together perfectly, the fit is fantastic and it looks a...
Read More
Richard B.
5.0 star rating 11/05/20
Love it, super easy and looks awesome
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
finally got my order little over a week ago. got it all cleaned up and put some upgrades. the result - one of the best freedom toy...
Read More
Ivan V.
5.0 star rating 11/10/20
Worth The Wait !!!
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
I received my GST-9 Kit and Jig 11-04-2020, and I purchased it on January 20th, THANKS PANDEMIC ! Ok now onto good stuff !! Right ...
Read More
Ian L.
5.0 star rating 09/25/20
Makes the P80 and Strike look like Legos
Product image for GST-9 Jig w/ Tool Kit & Slide Rails V1
GST-9 Jig w/ Tool Kit & Slide Rails V1
Having built a couple P80s (the Spectre, which was a nightmare and the v2, which was a marked improvement) this is a much nicer lo...
Read More
Chris J.
5.0 star rating 10/19/20
Finally received and worth the wait
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
This is an excellent pistol! I have many but this may be my favorite. The grip is extremely comfortable and feels easy. It doesn’t...
Read More
Brandon F.
5.0 star rating 10/22/20
WORTH THE WAIT!
Product image for GST-9 Pistol Frame V1
GST-9 Pistol Frame V1
Real customer here. Just got them today! Ordered in mid January but well worth the wait. Looks to be very high quality. Compared t...
Read More
CP
5.0 star rating 10/28/20
Easy Build. Great manufacturing receiver jig.
Product image for GST-9 Pistol Frame V1
GST-9 Pistol Frame V1
Easy build.
The fire control and other jig drilled holes were a perfect fit. I used Glock OEM parts for the slide and receive...
Read More
Tony G.
5.0 star rating 11/03/20
GST-9
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
WOW! I have waited for months and finally received my order today. It went together perfectly, the fit is fantastic and it looks a...
Read More
Richard B.
5.0 star rating 11/05/20
Love it, super easy and looks awesome
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
finally got my order little over a week ago. got it all cleaned up and put some upgrades. the result - one of the best freedom toy...
Read More
Ivan V.
5.0 star rating 11/10/20
Worth The Wait !!!
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
I received my GST-9 Kit and Jig 11-04-2020, and I purchased it on January 20th, THANKS PANDEMIC ! Ok now onto good stuff !! Right ...
Read More
Ian L.
5.0 star rating 09/25/20
Makes the P80 and Strike look like Legos
Product image for GST-9 Jig w/ Tool Kit & Slide Rails V1
GST-9 Jig w/ Tool Kit & Slide Rails V1
Having built a couple P80s (the Spectre, which was a nightmare and the v2, which was a marked improvement) this is a much nicer lo...
Read More
Chris J.
5.0 star rating 10/19/20
Finally received and worth the wait
Product image for GST-9: 80% Pistol Build Kit
GST-9: 80% Pistol Build Kit
This is an excellent pistol! I have many but this may be my favorite. The grip is extremely comfortable and feels easy. It doesn’t...
Read More
Brandon F.
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Unless specifically noted otherwise, products mentioned in this blog are not authorized, endorsed, manufactured or warrantied by GLOCK. GLOCK does not guarantee that these products are compatible with GLOCK pistols.

“GLOCK” is a federally registered trademark of GLOCK, Inc. and GLOCK Ges.m.b.H.. Neither 80 Percent Arms nor this website are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.mb.b.H.. The use of “Glock” on this page is merely to advertise the sale of GLOCK-style pistol frames, components and aftermarket parts that are compatible with Glock products. For additional genuine GLOCK, Inc. parts and products please visit www.glock.com.