Single Action Vs Double Action | Explained

Published on March 2, 2015
Duration: 9:29

This guide, presented by Steve from Top Guns, a professional firearm retailer and instructor, breaks down the fundamental differences between Single Action (SA) and Double Action (DA) trigger systems. It covers SAO revolvers, DAO revolvers, SA/DA semi-automatics, and striker-fired systems like Glock's, explaining the mechanics and practical implications of each for safe and effective firearm handling.

Quick Summary

Professional instructor Steve explains that Single Action (SA) requires manual hammer cocking for a light pull, while Double Action (DA) cocks and releases with one pull. DAO has a heavy pull every time, and striker-fired systems like Glock's are distinct, lacking external hammers and offering consistent pulls.

Chapters

  1. 00:15Introduction to SA vs DA
  2. 00:44SA/DA Revolver Mechanics (Ruger GP100)
  3. 02:48Single Action Only (SAO) Revolvers
  4. 03:27Double Action Only (DAO) Revolvers (Smith & Wesson)
  5. 04:35SA/DA Semi-Automatic Pistols (Sig Sauer)
  6. 06:03SAO Semi-Automatic Pistols (1911)
  7. 06:59Striker-Fired Systems (Glock)

Frequently Asked Questions

What is the main difference between Single Action and Double Action triggers?

Single Action (SA) requires manual cocking of the hammer before each trigger pull for a lighter, crisper shot. Double Action (DA) performs both cocking and releasing the hammer with a single, longer, heavier trigger pull.

Are all semi-automatic pistols Double Action?

No, semi-automatic pistols can be Single Action Only (SAO), Double Action/Single Action (DA/SA), or Striker-Fired. DA/SA pistols typically have a heavy first DA shot, followed by lighter SA shots after the slide cycles.

What is a Double Action Only (DAO) trigger system?

DAO systems have a consistent, long, and heavy trigger pull for every shot, as the trigger performs both cocking and releasing the hammer. They often lack an external hammer and are favored for concealed carry due to reduced snagging.

How does a Glock's 'Safe Action' system differ from traditional SA/DA?

Glock's 'Safe Action' is a striker-fired system. It uses a partially pre-cocked striker and has no external hammer. The trigger pull completes the cocking and releases the striker, offering a consistent pull distinct from traditional SA or DA mechanisms.

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