How Double-Action & DAO Revolver Triggers Work!..(For Dummies)

Published on March 11, 2026
Duration: 5:14

This guide explains the internal mechanics of double-action and double-action-only (DAO) revolver triggers, building on single-action principles. It details the roles of the trigger, hammer, hammer strut, and mainspring in both firing cycles, emphasizing the simplicity and reliability of revolver mechanisms. Instruction is provided by TheYankeeMarshal, who uses animated graphics to illustrate complex internal firearm operations.

Quick Summary

Double-action revolver triggers function by using the trigger pull to push the hammer strut upward, which then pushes the hammer back to a cocked position. The mainspring then releases the hammer to fire. Double-Action Only (DAO) revolvers omit the single-action capability, requiring a trigger pull for every shot.

Chapters

  1. 00:14Introduction & Single-Action Recap
  2. 00:28Single-Action Trigger Mechanism
  3. 00:58Double-Action Trigger Introduction
  4. 01:14Introducing the Hammer Strut
  5. 01:49Double-Action Firing Cycle
  6. 02:37Double-Action Reset Mechanism
  7. 03:47Double-Action Only (DAO) Explanation
  8. 04:07Summary & Revolver Reliability

Frequently Asked Questions

How does a double-action revolver trigger work?

In a double-action revolver, pulling the trigger causes its leg to push upward on the hammer strut. The strut then forces the hammer backward to a cocked position. The mainspring then drives the hammer forward to fire the round after it's released from the trigger's engagement.

What is the difference between a double-action and a double-action-only (DAO) revolver trigger?

A standard double-action revolver can be fired in single-action (hammer manually cocked) or double-action mode (trigger pull cocks and fires). A DAO revolver lacks the mechanism for single-action firing; the trigger must be pulled for every shot, performing both cocking and firing actions.

What is the role of the hammer strut in a double-action revolver?

The hammer strut is a crucial component that translates the force applied by the trigger's leg into the rearward movement of the hammer. It allows the trigger pull to both cock and release the hammer in a double-action cycle.

Why are revolvers considered reliable?

Revolvers are often cited for their reliability due to their simpler mechanical design compared to semi-automatic pistols. They have fewer moving parts and are generally less susceptible to ammunition-related malfunctions like failures to feed or eject.

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