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[Video+Review] 80% Arms GST-9: Easy Gucci Glock

We build our own Gucci Glock using the 80% Arms GST-9 Kit to find out if it’s as easy as it looks. Can it compete with the G19? Find out.

Unless you’ve been living under a rock, you’ve likely heard about 80% firearms.

They’re super popular right now.

Polymer 80 GST-9 Tan
80% projects are gaining steam among DIY gun owners.

But you might be asking…what are 80% projects?

The idea is that a polymer frame comes to you almost complete.

Your job is to mill out some plastic, do some finishing work, and get it assembled the rest of the way. 

80% Arms GST-9 Complete
With a little work, you could have this.

Sounds pretty simple and straightforward, right?

Well, it is!

While I took a stab at the 80% Arms Easy Jig Gen 3 to build out an AR-15, today, I’m trying my hand at the GST-9 Jig to make my very own Glock pistol clone.

Polymer 80 GST-9 Parts
80% Arms GST-9 bits and parts.

Using 80% Arms GST-9 frame and jig, I’ll do a complete project, top to bottom.

By the end of this, I’ll have a G19 clone, and you’ll know whether or not making your own Glock is right for you.

at 80% Arms

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

If you want to see the GST-9 process and watch me sling some lead at the range, check out my full video review below.

YouTube sometimes says it’s too dangerous and restricts it…so you might have to be signed in and click “Watch on YouTube.”

Also, make sure you check out the Pew Pew Tactical channel on YouTube for more gun goodness.

Table of Contents


GST-9: What’s That?

As I mentioned before, the GST-9 is 80% Arms’ take on the very popular Glock 19 model pistol.

In short, it’s a way for you to get a Gucci Glock without the Gucci price.


For this project, I opted for the GST-9 Complete Build Kit.

Price right now for the entire kit is $799. But you can always just go with the jig, which is priced at $29.

at 80% Arms

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Keep in mind; this is NOT a firearm. What that means for you is that it ships straight to your door.

The jig comes with all the drill bits you need to work on the GST-9 in addition to Glock rails.

80% Arms GST-9 Jig and Bits
80% Arms GST-9 Jig and bits.

On the other side of things, the Complete Build Kit ships with a completed Wraith RMR Cut Slide, G19 barrel, and a pair of grips.

Basically, the kit has EVERYTHING you need to complete the project!

80% Arms GST-9 in Jig
80% Arms GST-9 in Jig

You provide a drill, hammer, and punch. That’s it.

Pro Tip: I also used some sanding blocks to make everything feel nice and smooth.

at 80% Arms

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Building the GST-9

The GST-9 comes with clear directions you follow step-by-step.

You’ll focus your attention on the yellow and red sections and then drill three holes into the frame using the jig.

Directions for drilling are on the side of the jig — literally, that easy.

80% Arms GST-9 Instruction Manual
The instruction manual makes it pretty easy to follow along.

First step, put the jig together.

It comes with bolts, and it’s quick to assemble.

80% Arms GST-9 Assembling Jig
Pretty easy to assemble, if I do say so myself.

From there, begin the milling process.

I used wire cutters to work out the big pieces.

80% Arms GST-9 Milling
Mill using the included bits and your own drill.

Then I went to town milling the plastic frame with the included bit.

I took my time. Remember, you can always take plastic off, but you can’t put it back on. Go slow!

After I cut everything out, I sanded the frame down and got it slick and smooth.

80% Arms GST-9 Sanding Frame
I chose to sand things down for a smoother finish.

Then I…oh wait, that’s it. We’re done!

Well, not entirely, but from here, it’s just building as you would any other Glock — dropping in the trigger, rails, etc.

80% Arms GST-9 Parts
Drop in the rest of the parts.

If you’re new to this, no worries.

80% Arms offers a nice video with directions on YouTube to walk you through this process. It’s quick too, taking mere minutes.

80% Arms GST-9 Parts
Finishing up using the 80% Arms YouTube video.

After you tap in three pins, throw on the slide and select the grip you want to use…and your Frankenstein Glock is finished!

80% Arms GST-9 Complete
Look at that! All done!

Have you tried the GST-9 Build Kit? Rate it below!

Readers' Ratings

4.99/5 (530)

Your Rating?

A Little Range Testing

Before I hit the range, I raided my stash and collected every Glock magazine I could find to run in the GST-9.

I also grabbed some ammo — Blazer Brass and cheap Russian steel, to be precise.

80% Arms GST-9 Glock Mags
My Glock mag stash.

How did the gun do?

I’m happy to say…it ran great!

It fed, fired, ejected, and loaded perfectly. Not to mention, it locked back on empty.

80% Arms GST-9 Shooting Tan Left Side
Having some fun on the range.

How does it feel to shoot, though?

Well, it feels like a Glock BUT with a better grip. I really enjoyed it.

While it ran well, I did encounter one problem with a generic magazine.

80% Arms GST-9 Shooting Black Right
Only had one issue with a cheap knock-off mag.

The steel didn’t feed consistently.

Not a huge deal since the genuine Glock mags ran flawlessly, but it’s worth mentioning.

The Good and The Bad

The project went perfectly for me, but as with anything, there are some things to be wary of.

As I mentioned, knock-off cheap mags may be an issue.

80% Arms GST-9 Shooting Black Front
It ran pretty darn good!

The GST-9 didn’t seem to like those very much. Genuine Glock mags ran fine, though.

The other issue I ran into during the process was that the pin holes were really tight.

80% Arms GST-9 Pin in Frame
The pin holes were pretty tight but with a little extra love, I was able to make it work.

I ran the drill back through by hand and gently worked some extra polymer off.

After that, the pins went in no problem.

at 80% Arms

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Overall, though, I had a blast with this project! I loved that everything I needed was right there in the box.

I don’t need to send the frame out to be stippled, and I don’t have to worry about having the slide finished — all that is already done for you.

80% Arms GST-9 Tan in Box
You got all you need in the box.

Even better, the slide is RMR compatible, so it’s ready to accept a red dot.

Can’t beat that!

80% Arms GST-9 Tan Slide
The slide comes ready to toss on the completed pistol.


If you’re after a Gucci Glock without spending a fortune, the 80% Arms GST-9 is the project for you. With an hour or so of work, you get a Glock 19 clone in Black, FDE, or OD Green with RMR cut slide.

80% Arms GST-9 Shooting Tan
So cool!

The jig was easy to use and the directions were refreshingly clear.

With a price hovering around $800 for the complete build or $30 for the jig, this is a fun, easy project for pistol lovers.

at 80% Arms

Prices accurate at time of writing

Prices accurate at time of writing

Available Coupons

Don’t forget to watch the full video review of the GST-9 by 80% Arms below.

Have you built your own pistol or rifle using an 80% kit? Let us know how it turned out in the comments below. Also check out our review of the 80% Arms Easy Jig Gen 3, and check out our list of the Best 80% Lower Receivers & Jigs for all your AR needs.

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11 Leave a Reply

  • Commenter Avatar

    Has anyone experienced the front locking block not sitting level with the frame? What fixes did you take? Other than 80% Arms, where can a replacement locking block be purchased?

    June 19, 2022 2:17 pm
  • Commenter Avatar

    You guys dont deliver to Canada?

    February 26, 2021 9:31 am
  • Commenter Avatar
    lt moon

    80% builds are fun projects. I haven't used this particular supplier. I have built both 80% billet and Polymer80 ar-15 lowers, obviously polymer is easier for the home hobbyist to work with, and I don't recommend aluminum billet unless you have access to a full-blown floor stand (not a bench stand) drill press, or a machine mill. Pistol polymer type 80's are quite easy if you're the DIY type of car/home owner with good basic tools. I've completed polymer kits for G19 and Sig P320. Sig was an all-Sig kit except for "JSD frame & required jig" and while reasonably easy to complete with normal hand tools, it requires some skills with those tools and some patience in assembly, the outcome is a more desirable weapon than the Poly80 or GST9 G19. However ... a poly 80% is very easy to home complete - a Dremel is nice to have but really just a quality 1/2inch or even just 3/8inch electric hand drill, bastard file, fine sanding block, punch drives and small hammer, assorted small screwdrivers and needle nose pliers. Make sure to watch manufacturer's recommended videos, follow instructions, take your time, use manufacturer or very high grade 3rd party parts to complete your build, and then take pride and enjoy your handiwork.

    February 6, 2021 2:38 pm
  • Commenter Avatar

    OK,, the one really important question I did not see answered is... How does it compare to Polymer 80's??? If given the choice between the two, which would you choose?

    February 5, 2021 4:59 pm
    • Commenter Avatar

      I have been trying to find out exactly that. It would be great to have a comparison between the 80% Arms and Polymer80 pistols.

      February 7, 2021 7:43 pm
  • Commenter Avatar

    The issue with 80 percent arms is that they don't have stock to fulfill orders. You can't order this kit currently and their website is saying orders from April, 2020 are shipping at the end of this month, February, 2021.

    February 5, 2021 3:21 pm
  • Commenter Avatar
    Jim Day

    Built 3 , but used Polymere80 lowers ... And most important for builders is to seek out and try and use only OEM GLOCK parts kits if you can find them because they work best ... Not that others don't work but it's best to start out with what works for the factory first , he sure your build works correctly before changing to aftermarket stuff ... As far as the pistol lowers go , they are ridiculously simple ., Going slow it takes about an hr and after you've done one the next one takes about 20 min . 10x easier than milling an AR 80% lower ... They'll argue about it but these things are almost a joke calling them an 80% because I consider them about a 95% they're so simple a kid could build one .. And I built 2 for the price you paid for 1 because 800.00 is expensive as hell for a kit ... I paid 420.00 for complete kit , all oem parts as well ... That brand is the one that I hear took forever to get them out , after taking pre orders ...
    Done building now but good luck for those wanting to build a pistol as your so called President is gonna make 80% build tough to get .. If not illegal to build ... Eff em

    February 5, 2021 10:26 am
    • Commenter Avatar
      Joel Bronson

      where did you purchase your kit for $420 and how long did it take from purchase to doorstep?

      February 18, 2021 4:13 am
  • Commenter Avatar

    Great write up, one issue with these 80% lowers is getting holsters for them. I make holsters for the p80's and these look to have the same issue of not working with standard glock holsters.

    February 5, 2021 8:24 am
    • Commenter Avatar

      Compatible with Glock 3rd generation parts, holsters, & aftermarket accessories. GST-9 is the first and only 80% lower that is compatible with Glock holsters
      (From companies website)

      February 5, 2021 5:43 pm
  • Commenter Avatar
    Uniball Lenny

    Great review and video. Your video editors and videographers do such a great job, keep up the awesome work! Oh and I am mad at you guys because now I’m gonna spend more money on another gun!

    February 4, 2021 8:21 pm
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