How to Install an AR-15 Hammer & Trigger Assembly Presented by Larry Potterfield of MidwayUSA

Published on July 19, 2018
Duration: 3:02

This guide details the installation of the AR-15 hammer and trigger assembly. It covers identifying components, assembling the trigger sub-assembly, and installing both the trigger and hammer into the lower receiver using specialized tools like slave pins. The process concludes with essential function testing and a trigger pull measurement.

Quick Summary

To install an AR-15 hammer and trigger, first assemble the trigger, disconnector, and springs. Use a slave pin to align these components in the lower receiver while inserting the trigger pin. Then, position the hammer with its spring legs on the trigger pin and drive the hammer pin. Finally, perform function tests with a hammer block and measure trigger pull.

Chapters

  1. 00:00Introduction to AR-15 Fire Control System
  2. 00:13Identifying Trigger & Hammer Components
  3. 00:33Assembling the Trigger Sub-Assembly
  4. 01:42Installing the AR-15 Trigger Assembly
  5. 02:05Installing the AR-15 Hammer Assembly
  6. 02:19Function Testing & Safety Precautions
  7. 02:45Measuring Trigger Pull Weight

Frequently Asked Questions

What are the essential components for installing an AR-15 hammer and trigger assembly?

You'll need the trigger, disconnector, hammer, their respective springs, and two pins (trigger pin and hammer pin). A slave pin is also highly recommended for easier alignment during installation.

What is the purpose of a slave pin when installing an AR-15 trigger?

A slave pin is used to temporarily hold the trigger and disconnector components in place and aligned within the lower receiver. This prevents them from shifting while you drive the permanent trigger pin through.

Why is a hammer block important during AR-15 function testing?

A hammer block is a safety device inserted into the magazine well. It prevents the hammer from striking the receiver or bolt catch if the trigger is pulled accidentally during dry fire testing, protecting the firearm.

How is the trigger pull weight measured on an AR-15?

Trigger pull weight is measured using a specialized gauge, such as a Lyman digital trigger pull gauge. The gauge is attached to the trigger, and the force required to pull it is recorded.

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