How to Change a Trigger on an AR-15! (CMC)

Published on January 20, 2020
Duration: 13:32

This video provides a step-by-step guide on how to replace the stock trigger on an AR-15 platform rifle with a CMC drop-in trigger. The process involves disassembling the lower receiver, removing the old trigger and hammer components, and installing the new trigger assembly. The presenter emphasizes the ease of installation for drop-in triggers and demonstrates the use of pins and set screws to secure the new trigger, recommending Loctite for added security.

Quick Summary

Installing a CMC drop-in trigger on an AR-15 significantly reduces trigger pull weight from an average of 8 pounds to a crisp 3.5 pounds. The process involves separating receivers, removing trigger and hammer pins, and installing the new unit, often requiring grip removal for the safety selector. CMC recommends using Loctite on the securing set screws for optimal performance and reliability.

Chapters

  1. 00:00Introduction and Trigger Upgrade Goal
  2. 00:37Measuring Stock Trigger Pull Weight
  3. 01:55Preparing for Trigger Replacement
  4. 02:13Separating Upper and Lower Receivers
  5. 02:50Removing the Original Trigger Pin
  6. 04:20Removing the Second Trigger Pin and Assembly
  7. 04:52Unboxing the CMC Trigger
  8. 05:18Removing the Grip for Safety Selector Access
  9. 06:02Removing the Safety Selector
  10. 06:32Installing the CMC Trigger
  11. 07:10Installing the New Trigger Pins
  12. 08:33Securing Pins with Set Screws and Loctite
  13. 09:50Finalizing Trigger Installation
  14. 10:38Reassembling and Testing the Rifle
  15. 10:54Testing New Trigger Pull Weight
  16. 12:03Conclusion and Satisfaction with Upgrade

Frequently Asked Questions

What is the typical trigger pull weight of a stock AR-15, and how does a CMC drop-in trigger compare?

The stock trigger pull weight on the AR-15 in this video was measured at approximately 8 pounds. The CMC drop-in trigger installed is advertised as a 3.5-pound pull, offering a significantly lighter and crisper feel, making it a substantial upgrade for improved shooting accuracy and control.

What tools are necessary to install a CMC drop-in trigger on an AR-15?

To install a CMC drop-in trigger, you will need a punch set and a hammer to remove and install the trigger and hammer pins. An Allen wrench is required if your grip requires it for removal. The use of Loctite on the set screws is also recommended by CMC for added security.

What are the key steps involved in replacing an AR-15 trigger with a CMC drop-in unit?

The process involves ensuring the rifle is unloaded, separating the upper and lower receivers, removing the old trigger and hammer pins, and then removing the old trigger assembly. The new CMC trigger is then installed, followed by the safety selector (which may require grip removal), and finally, the new trigger pins are secured, ideally with Loctite on the set screws.

Does installing a CMC drop-in trigger require extensive gunsmithing knowledge?

No, CMC drop-in triggers are designed for ease of installation. While some intermediate steps like removing the grip and safety selector are necessary, the process is straightforward and does not typically require advanced gunsmithing skills, making it a popular DIY upgrade for AR-15 owners.

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