Zastava M90 UPDATE: HUGE UPGRADES, 3 Years of ownership.

Published on December 3, 2023
Duration: 29:01

This video details extensive modifications to a Zastava M90 rifle, focusing on barrel shortening and the installation of a tunable gas block. The barrel was cut to 16 inches, and a custom gas block with an adjustable front sight was fitted, requiring significant gunsmithing. These upgrades aim to improve the rifle's performance in competition by reducing weight and enhancing adjustability.

Quick Summary

The Zastava M90 received significant upgrades, including a barrel cut to 16 inches and the installation of an AAM Defense tunable gas block by M13 Industries. This tunable gas block also features an adjustable AR-15 style front sight, enhancing its competition readiness. The Unrivaled 3-chamber brake was pinned and welded to the barrel, contributing to its flat shooting characteristics.

Chapters

  1. 00:00Sponsor: Third Pin Threads
  2. 03:21Introduction: Zastava M90 Update
  3. 04:01Work Done at M13 Industries
  4. 04:33Upcoming Competition: Colash Bash Texas
  5. 05:49Past Performance Issues
  6. 06:40Factory Specs & Weight
  7. 07:13Barrel Modification: 16-inch Cut
  8. 08:48Muzzle Device: Unrivaled Brake
  9. 09:28Gas Block Upgrade: AAM Defense Tunable
  10. 11:15Tunable Gas Block Features
  11. 12:14Gas Block Mounting Challenges
  12. 13:03Competition Brake Choice
  13. 13:59Current Setup Overview
  14. 14:12Handguard: RS Regulate GKR-9DY
  15. 14:40Stock and Furniture
  16. 15:14Optic: SRO on RS Regulate Rail
  17. 15:43Weight Check Post-Modification
  18. 17:28Live Firing: V-Tech Barricades
  19. 20:51First Run Results
  20. 22:26Second Run: Downloaded Mags
  21. 25:26Third Run: Reload
  22. 27:42Overall Impressions & Readiness
  23. 28:14Shoutout & Future Competition

Frequently Asked Questions

What modifications were made to the Zastava M90 in the video?

The Zastava M90 had its 18-inch barrel cut down to 16 inches by M13 Industries. An AAM Defense tunable gas block was installed, requiring the original gas port to be welded and relocated. A Unrivaled 3-chamber brake was pinned and welded to the barrel.

Why is a 16-inch barrel preferred for a 5.56 AK in competition?

A 16-inch barrel for a 5.56 AK is preferred over shorter lengths like 14.5 inches for competition to maintain ballistic performance. This helps reduce the extreme adjustments needed for optics (dope) when engaging targets at longer distances, such as 600 yards.

What are the benefits of the AAM Defense tunable gas block on the Zastava M90?

The AAM Defense tunable gas block allows for on-the-fly gas adjustment, crucial for competition. It also features a fully adjustable AR-15 style front sight post for elevation and windage, a rare feature on AK gas blocks.

How does the modified Zastava M90 handle recoil and weight?

Despite its significant weight (nearly 9 lbs unloaded), the modifications, including the Unrivaled muzzle brake and weight redistribution, help manage recoil effectively. The rifle remains flat-shooting, making it manageable for competition despite its heft.

Where can one get custom work done on AK platforms like the Zastava M90?

The video highlights M13 Industries in Las Vegas as the gunsmith that performed the extensive modifications on the Zastava M90. They specialize in custom AK work, including barrel modifications and gas block installations.

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