How The AR-15 Trigger Works

Published on March 6, 2026
Duration: 16:05

This video provides a comprehensive explanation of how AR-15 triggers function, detailing the mechanics of both single-stage and two-stage systems. It breaks down key components like the sear, disconnector, and hammer, and explains critical concepts such as trigger break, reset, pull weight, and creep. The instructor also touches on manufacturing processes like Wire EDM and the differences between mil-spec and drop-in triggers, offering advice for trigger upgrades.

Quick Summary

The AR-15 trigger system comprises several key components: the trigger itself, its spring for tension, the sear that holds the hammer, the disconnector that catches the hammer after firing, and the hammer which strikes the firing pin. Understanding how these parts interact, especially the sear's engagement and disengagement with the hammer, is fundamental to how the trigger functions and feels.

Frequently Asked Questions

What are the main components of a single-stage AR-15 trigger?

A single-stage AR-15 trigger assembly includes the trigger itself, the trigger spring for tension, the sear that engages the hammer, the trigger bow for finger contact, the trigger pinhole housing, a disconnector recess, and a rear flat surface that interacts with the safety selector.

How does a two-stage AR-15 trigger differ from a single-stage trigger?

In a two-stage trigger, the sear is positioned opposite the disconnector, and the hammer has a T-shaped catch. This setup creates a distinct two-stage pull: a first stage (takeup) where internal travel occurs until a wall is felt, followed by a second stage (brake) where the hammer is released.

What is trigger creep and why is it undesirable?

Trigger creep is the gritty or jerky movement felt in a trigger before it breaks. It's undesirable because inconsistent movement can easily throw off your shot, impacting accuracy. High-end triggers aim to minimize or eliminate creep.

What is the importance of trigger reset in an AR-15?

Trigger reset is the point where the sear re-engages the hammer after firing, making the rifle ready for the next shot. A short, tactile, and audible reset is crucial for fast follow-up shots and overall shooting cadence.

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