GST-9: Instructions and Troubleshooting

Instruction Manual

Frequently Asked Questions 

What parts do I still need to build my gun?

What parts are compatible?

How do I install an LPK?

My handgun isn't cycling well, what do I do?

I ruined my frame, what do I do?

Your FAQ doesn't answer my question, how do I get more help? 


What Parts Do I Still Need To Build My Gun?

You will need a lower parts kit, a magazine, a slide, a barrel, recoil spring, slide completion kit, and sights. It's not as much as it sounds! Complete Upper Kits include most of it, if you go that route. Whichever parts you choose, they must be Glock 19 Generation 1-3 compatible.

What Parts Are Compatible?

Glock 19 Generation 1-3

How Do I Install A Lower Parts Kit (LPK)? 

We found this video very helpful.

My handgun isn't cycling well, what do I do?

First, make sure that all plastic has been completely removed and sanded smooth. Tolerances are tight, so if you leave a little plastic, the friction on the slide can impede travel. Second, make sure all components are installed correctly, and lubrication has been applied where necessary. Lastly, when working new parts in together (especially from several different companies as is common in handgun builds), make sure you are using full-power ammunition (steel-case ammo is notoriously under-powered), and allow a break in period of 200 rounds. Still having issues? Send our support team a message on our Contact page, or by sending us an email at:

I Ruined My Frame, What Do I Do?

We're here to help! Review our Warranty Policy, and Contact our Support Team. 

Your FAQ Doesn't Answer My Question, How Do I Get More Help? 

You can live-chat us during business hours, e-mail us, call us, or even drop by if you're local! All information is on our Contact page.