PS90 just became worth it!!!

Published on March 9, 2026
Duration: 3:48

This guide details the installation and operation of the X-PRT90 progressive trigger system for the FN PS90 SBR. The X-PRT90 offers a unique third position that allows for a faster rate of fire by pushing through the trigger pull, effectively creating a legal 'forced reset' malfunction. The video also touches on CMMG barrel modifications and the PS90's unique bottom ejection.

Quick Summary

The X-PRT90 trigger system for the FN PS90 SBR offers a unique progressive trigger. In its third position, pushing further through the trigger pull achieves a faster rate of fire, effectively creating a legal 'forced reset' malfunction for rapid follow-up shots.

Chapters

  1. 00:06PS90 Firearm Overview
  2. 00:14Magazine and Caliber: 5.7x28mm
  3. 00:20SBR Design and CMMG Barrel
  4. 00:31CMMG Suppressor Details
  5. 00:36Loading and Ambidextrous Controls
  6. 00:44Simple Disassembly and Iron Sights
  7. 00:50Introducing the X-PRT90 Trigger
  8. 00:57Sponsor Acknowledgements: SDI & AMMO SQUARED
  9. 01:21X-PRT90 Trigger Operation Explained
  10. 01:31Progressive Trigger System: Faster Fire Rate
  11. 01:57X-PRT90 Development Team
  12. 02:10Unique Bottom Ejection Port
  13. 02:26Low Recoil and Control in 5.7mm
  14. 02:35CMMG Barrel Modification Tip: Beveling Chamber
  15. 02:55X-PRT90 Product Praise
  16. 03:10Magazine Capacity and Suppressor Use

Frequently Asked Questions

What is the X-PRT90 trigger system for the FN PS90?

The X-PRT90 is a three-position trigger system for the FN PS90 SBR that offers safe semi-automatic fire and a progressive third position. This third position allows for a faster rate of fire by pushing further through the trigger pull, effectively creating a legal 'forced reset' malfunction.

What are the key features of the FN PS90 SBR shown in the video?

The FN PS90 SBR features a unique bullpup design, a 10.4-inch CMMG barrel, a top-loading magazine for 5.7x28mm ammunition, and a bottom ejection port. It is also equipped with a CMMG Zeroed Series suppressor and an EOTech red dot sight.

What modification is recommended for CMMG barrels on an FN PS90?

It is recommended to slightly bevel the chamber of CMMG barrels when installed on an FN PS90. This prevents sharp edges from snagging brass casings, which can lead to hang-ups and double feeds, ensuring smoother operation.

How does the progressive trigger system on the X-PRT90 work?

The X-PRT90's progressive trigger system has a normal semi-automatic reset. However, in its third position, pushing further through the trigger pull achieves a faster rate of fire, essentially acting as a legal 'forced reset' malfunction by allowing for rapid follow-up shots.

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