Single vs Double Action

Published on March 28, 2024
Duration: 0:55

This guide breaks down the fundamental differences between single-action and double-action trigger mechanisms, as explained by JaredAF. It covers how each type functions, variations like DA/SA and DAO, and highlights specific firearm examples like the Sig Sauer P210 (SAO) and Smith & Wesson revolvers (often DA/SA). Understanding these distinctions is crucial for safe and effective firearm operation.

Quick Summary

A double-action trigger performs two functions in a single pull: it cocks the hammer and then releases it to fire. A single-action trigger requires the hammer or striker to be pre-cocked; its sole job is to release that stored energy. Many firearms offer both DA/SA modes, while some are strictly DAO or SAO.

Chapters

  1. 00:00Double Action Definition
  2. 00:11Single Action Definition
  3. 00:22DA/SA and DAO Variations
  4. 00:37Single Action Only (SAO) Autoloaders

Frequently Asked Questions

What is the difference between single-action and double-action triggers?

A double-action trigger performs two functions in one pull: cocking the hammer and releasing it to fire. A single-action trigger requires the hammer to be pre-cocked; its only job is to release that stored energy.

What does SAO mean for a firearm?

SAO stands for Single Action Only. This means the firearm's trigger only performs one function: releasing the hammer or striker. The hammer must be manually cocked (e.g., by racking the slide) before the trigger can be pulled to fire.

Can a firearm have both single and double-action modes?

Yes, many firearms, particularly traditional revolvers and some semi-automatic pistols, are designed as Double Action / Single Action (DA/SA). This allows the user to choose between the two trigger functions.

What is a DAO firearm?

DAO stands for Double Action Only. In these firearms, every trigger pull performs both the cocking and firing functions. They typically lack an external hammer that can be manually cocked, often seen in hammerless revolvers.

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