Zastava M90 OUT of GAS!

Published on December 19, 2021
Duration: 22:00

The Zastava M90 undergoes a rigorous 'Sand Tornado Test' with its adjustable gas block set to maximum. Initial testing reveals a failure to eject after about 10 rounds, attributed to sand ingress and a gas setting ring that jumped out of its locked position. The primary issue identified is the gas regulator retainer bracket's tendency to lose tension under recoil, requiring manual bending for a secure fit.

Quick Summary

The Zastava M90 failed during a sand test because its adjustable gas block setting ring jumped out of position due to recoil and sand ingress. Adjusting the gas block 'on the fly' can deform the retainer bracket, causing loss of tension. For secure adjustment, bend the bracket manually while the gas tube is removed.

Chapters

  1. 00:00Sand Tornado Test Intro & Gas Block Setup
  2. 01:25Test Execution & Initial Malfunction
  3. 02:41Internal Inspection for Sand Ingress
  4. 06:04Identifying Gas Block Setting Failure
  5. 11:11Field Adjustment Issues & Recurrent Failures
  6. 13:31Diagnosis & Corrective Action for Gas Block

Frequently Asked Questions

What caused the Zastava M90 to malfunction during the sand test?

The Zastava M90 malfunctioned due to sand ingress and the gas setting ring jumping out of its locked position under recoil. This prevented the rifle from completing its cycling action, resulting in a failure to eject.

How can the Zastava M90's adjustable gas block tension be improved?

The gas regulator retainer bracket's tension can be improved by manually bending it into a more secure, high-tension position. This adjustment is best performed when the gas tube is removed to ensure proper access and leverage.

Is it safe to adjust the Zastava M90's gas block on the fly?

No, adjusting the gas block setting 'on the fly' by lifting the bracket with a round can deform the metal, leading to a loss of tension and potential cycling failures. It's recommended to adjust only when the gas tube is removed.

What are the technical specifications of the Zastava M90 tested?

The Zastava M90 tested features a 5.56x45mm NATO caliber, an 18.25-inch barrel, a 3-position adjustable gas system, and a 1.5mm bulged trunnion receiver.

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