Geissele ACR Trigger Installation

Published on February 22, 2018
Duration: 5:22

This guide details the installation of a Geissele trigger into a Bushmaster ACR. It highlights the critical step of correctly orienting the original Bushmaster hammer spring to engage the safety selector detent, a unique requirement for the ACR platform. The process is compared to standard AR-15 trigger installations, with emphasis on the specific hammer spring interaction.

Quick Summary

Installing a Geissele trigger in a Bushmaster ACR requires using the original ACR hammer spring due to its unique leg shape, which provides tension to the safety selector. This leg must engage a specific groove on the trigger pack for proper function, a step distinct from standard AR-15 trigger installations.

Chapters

  1. 00:02Introduction to Geissele and ACR
  2. 00:49Original ACR Trigger Removal
  3. 01:00Hammer Spring Importance
  4. 01:12Hammer Spring Leg Explanation
  5. 01:40Trigger Pack Assembly
  6. 02:00Safety Detent Tension
  7. 02:24Adjusting Hammer Spring Leg
  8. 02:45Trigger Pack Reinstallation
  9. 03:00Dry Fire and Initial Impressions
  10. 03:12Live Fire Testing
  11. 03:33Performance Review
  12. 03:51Instructional Feedback
  13. 04:22Overall Trigger Assessment
  14. 04:51Conclusion and Links

Frequently Asked Questions

What is the key difference when installing a Geissele trigger in an ACR compared to an AR-15?

The primary difference is the need to use the original Bushmaster ACR hammer spring. Its uniquely shaped leg must be correctly positioned to engage a groove on the trigger pack, providing essential tension for the safety selector mechanism.

Why is the original Bushmaster ACR hammer spring required for Geissele trigger installation?

The original ACR hammer spring has a leg that is intentionally kicked over to one side. This specific design interacts with the ACR's trigger pack and safety selector, ensuring proper tension and function that a standard AR-15 hammer spring cannot provide.

How does the Geissele ACR trigger improve the shooting experience?

The Geissele trigger offers a lighter pull weight and a crisper break compared to the stock ACR trigger. Users report a quieter hammer fall and a more refined feel, enhancing overall shooting dynamics and control.

What are the main criticisms of the Geissele ACR trigger installation instructions?

The instructions are criticized for being insufficient. They rely on users following Bushmaster's general instructions and lack specific diagrams or detailed steps for the unique aspects of the ACR trigger installation, particularly regarding the hammer spring.

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