Why I’m Quitting the M90

Published on April 12, 2026
Duration: 11:51

Mark from Fit'n Fire discusses his return to the Zestiva M90 for the Kalash Bash competition due to delays with another rifle. He details his preparation, including zeroing the rifle at 50 yards for optimal performance at 200 yards, and discusses modifications like the JMAC Customs MMS handguard and the Aero Arms RMR mount, highlighting the importance of a reliable optic mount.

Quick Summary

Mark from Fit'n Fire is returning to the Zestiva M90 for competition due to an unavailable upgrade rifle. He trusts its proven performance, having achieved high placements in events like Kalashnicon. Key modifications include the JMAC Customs MMS handguard and the reliable Aero Arms RMR mount, with a 50-yard zero strategy for optimal 200-yard accuracy.

Chapters

  1. 00:05Introduction & Channel Welcome
  2. 00:16Zestiva M90 Overview & Competition History
  3. 01:30Reason for Returning to the M90
  4. 02:02Preparation for Kalash Bash
  5. 02:20Honest Review: Good and Bad
  6. 02:51Handguard Modifications: RS Regulate vs. JMAC MMS
  7. 03:38Optic Mount: Aero Arms RMR Mount Reliability
  8. 04:32Issue with Railed Dust Cover Holding Zero
  9. 05:44SY Optics Bull X Pro Performance
  10. 06:13JMAC MMS Handguard Mag Funnel Integration
  11. 06:53RD360 Optic & Chemo Mount System
  12. 07:34Zeroing Strategy: 50 Yards for 200 Yards
  13. 08:38Testing the 50 Yard Zero at 25 Yards
  14. 09:43Final Accuracy Check at 25 Yards
  15. 10:01Future Plans: Round Count & Internal Inspection
  16. 10:26Competition Nerves & Physical Challenges
  17. 10:59Viewer Engagement & M90 Discussion
  18. 11:26Closing Remarks & Sign-off

Frequently Asked Questions

Why is the speaker returning to the Zestiva M90 for competition?

The speaker is returning to the Zestiva M90 for the Kalash Bash competition because a planned upgrade rifle (M23) was not available in time. He trusts the M90's proven performance after extensive use and competition success.

What are the key modifications made to the Zestiva M90 for competition?

Key modifications include the JMAC Customs MMS handguard for its integrated mag funnel and the Aero Arms RMR mount for reliable optic zero. The speaker also uses the SY Optics Bull X Pro and RD360 optics.

What is the recommended zeroing strategy for the Zestiva M90 for competition?

The recommended zeroing strategy is at 50 yards. This provides a trajectory that is approximately 1 inch high at 200 yards, which is the longest expected engagement distance for the Kalash Bash competition, ensuring minimal deviation.

What issues were encountered with the JMAC Customs MMS handguard's railed dust cover?

The railed dust cover on the JMAC Customs MMS handguard was not holding zero, leading to inconsistent shot placement at 200 yards during practice. This prompted a return to the more reliable Aero Arms RMR mount.

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