GUN TERMINOLOGY: Trigger Pull Systems

Published on July 24, 2017
Duration: 3:55

This video provides a beginner-friendly explanation of common firearm trigger pull systems. It details Double Action Only (DAO) with heavy pulls (10-12 lbs), Single Action (SA) with light pulls (around 4 lbs), and Double Action/Single Action (DA/SA) which starts with a heavy pull and transitions to a light pull. It also covers Striker Fired systems, common in polymer pistols like Glocks, offering a consistent pull weight of 5-6 lbs.

Quick Summary

Firearm trigger systems include Double Action Only (DAO) with heavy 10-12 lb pulls, Single Action (SA) with light ~4 lb pulls, and Double Action/Single Action (DA/SA) which starts heavy and becomes light. Striker Fired systems, common in polymer pistols, offer a consistent 5-6 lb pull for every shot.

Chapters

  1. 00:01Introduction
  2. 00:21Double Action Only (DAO)
  3. 00:52Single Action (SA)
  4. 01:36Double Action Single Action (DA/SA)
  5. 02:21Striker Fired Systems
  6. 03:07Summary and Conclusion

Frequently Asked Questions

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

A Double Action Only (DAO) trigger system requires a heavy pull, typically between 10 to 12 pounds, to both cock and release the hammer for every shot. The trigger pull cocks the hammer and then releases it to fire the round.

How does a Single Action (SA) trigger work on a firearm?

In a Single Action (SA) system, the hammer is already cocked, so the trigger pull is light, usually around 4 pounds. The trigger's sole function is to release the hammer to fire the round.

What is the difference between DA/SA and DAO trigger systems?

DA/SA (Double Action/Single Action) starts with a heavy pull for the first shot, then subsequent shots use a lighter single action pull. DAO (Double Action Only) uses the same heavy pull for every shot.

What are common characteristics of Striker Fired trigger systems?

Striker Fired systems, found in many polymer pistols, offer a consistent trigger pull weight, typically 5 to 6 pounds, for every shot. The striker is partially cocked by the slide and fully released by the trigger.

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