Installation - Mossberg JM Pro Trigger

Published on September 23, 2022
Duration: 9:13

This guide details the installation of the Mossberg JM Pro drop-in trigger assembly, presented by Lena Miculek. It covers the complete disassembly of the original trigger mechanism, including careful removal of small springs and pins, and the subsequent installation of the new trigger. The video emphasizes safety precautions and provides a baseline trigger pull weight measurement of the stock trigger (around 6.5 lbs) and the installed JM Pro trigger (around 3.5 lbs), highlighting the significant improvement in performance and feel.

Quick Summary

The Mossberg JM Pro drop-in trigger offers a significant upgrade over stock triggers, with a pull weight averaging around 3.5 pounds compared to the stock 6.5 pounds. Its unique design places the sear on the back of the hammer, reducing release energy for a lighter, more consistent, and durable pull.

Chapters

  1. 00:00Introduction & Stock Trigger Pull
  2. 00:30Disassembly of Original Trigger
  3. 01:40Removing Hammer and Sear Pins
  4. 02:02Introducing the JM Pro Trigger
  5. 02:10JM Pro Trigger Design Features
  6. 02:45Installing the JM Pro Trigger Assembly
  7. 03:00Reinserting Pins and Safety Lever
  8. 03:18Reassembling Grip and Safety Plunger
  9. 03:40Testing Safety Functionality
  10. 04:19Final Grip Screw Tightening
  11. 04:35Reassembling Firearm Components
  12. 04:42Post-Installation Trigger Pull Test
  13. 04:53Trigger Adjustment Feature Mention
  14. 05:12Final Trigger Pull Results
  15. 05:44Conclusion

Frequently Asked Questions

What is the typical trigger pull weight of a stock Mossberg modern sporting rifle?

The stock trigger pull weight on the Mossberg modern sporting rifle demonstrated in this video was measured to be around 6.5 pounds, with individual pulls ranging from approximately 6 pounds 5 ounces to 6 pounds 14 ounces.

What is the trigger pull weight of the Mossberg JM Pro drop-in trigger?

Out of the box, the Mossberg JM Pro drop-in trigger breaks at approximately 3 pounds 7 ounces to 3 pounds 8 ounces, offering a significantly lighter and crisper pull compared to the stock trigger.

What are the key advantages of the Mossberg JM Pro trigger design?

The JM Pro trigger's primary advantage is its sear assembly located on the back of the hammer, which requires significantly less energy to release. This design leads to a lighter, more consistent, and durable trigger pull with less stress on the engagement surfaces.

What tools are needed to install the Mossberg JM Pro trigger?

Installation requires basic tools including an Allen wrench for the grip screw, a bench block or spacer for pin removal, a punch set, and a trigger pull gauge to measure the weight before and after installation.

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