Is This Pistol STILL RELEVANT? - TheFirearmGuy

Published on January 18, 2026
Duration: 5:55

TheFirearmGuy provides an in-depth look at the 80% Arms GST-9, a Glock-style pistol. He highlights its modularity, including interchangeable backstraps that allow for Glock 19 or Glock 45/19X grip sizes, and its RMR/RMS optic footprint. The review includes range footage demonstrating reliable performance with its fluted barrel and nickel boron internals. The host notes the GST-9's improved market competitiveness due to a recent price drop to approximately $600.

Quick Summary

The 80% Arms GST-9 is a Glock-style pistol featuring a modular grip system that can be configured for Glock 19 or Glock 45/19X sizes, and it supports direct mounting of RMR/RMS footprint optics. With a price drop to around $600, it offers competitive value against standard Glocks, demonstrating reliable performance with its fluted barrel and nickel boron internals.

Chapters

  1. 00:00Introduction & Relevancy Series
  2. 00:41Sig P320 XCompact Recap
  3. 02:0180% Arms GST-9 Features Walkthrough
  4. 02:44Range Performance Test
  5. 02:57Pricing and Market Competitiveness
  6. 04:50Modular Backstrap Innovation

Frequently Asked Questions

What are the key features of the 80% Arms GST-9?

The 80% Arms GST-9 features a modular grip system allowing for Glock 19 or Glock 45/19X sizes, a direct mount optic system with an RMR/RMS footprint, a fluted barrel, and nickel boron coated internals. It also has a full picatinny rail and a serialized frame plate.

How does the 80% Arms GST-9 compare in price to Glocks?

The 80% Arms GST-9 is now priced around $600, making it competitive with standard Glock models like the Glock 19, Glock 45, and Glock 19X, especially considering its enhanced feature set.

What is the significance of the modular backstrap on the GST-9?

The modular backstrap allows users to easily adjust the grip size of the GST-9. It can be converted from a Glock 19 size to a Glock 45/19X size, which typically accommodates a 17-round magazine capacity.

What optic footprint does the 80% Arms GST-9 support?

The 80% Arms GST-9 supports a direct mount optic system with an RMR/RMS footprint. This allows for the mounting of popular red dot sights designed for these specific mounting patterns.

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