Stupid Gun Questions: How Does a SEAR Work?

Published on September 1, 2018
Duration: 8:16

This video provides an expert-level explanation of how a SEAR (Sear) mechanism functions in firearms, presented by TheYankeeMarshal. It details the SEAR's role in holding the hammer back and its interaction with the trigger mechanism, emphasizing that most firearms with a trigger-activated firing pin or hammer utilize a SEAR. The instructor encourages newcomers to ask questions, highlighting the importance of understanding fundamental firearm components.

Quick Summary

A SEAR (Sear) is a crucial firearm component that holds the cocked hammer or striker back until the trigger is pulled. It interacts with the trigger mechanism, often via a trigger bar, and its spring tension directly contributes to the trigger pull weight. SEARs are found in most semi-automatic, double-action, and striker-fired firearms.

Chapters

  1. 00:11Gun Terminology Intimidation
  2. 00:50Introducing the SEAR Mechanism
  3. 01:07What is a SEAR?
  4. 01:26Encouraging Questions
  5. 01:47Demonstrating SEAR Function
  6. 01:55SEAR's Role in Hammer Activation
  7. 02:08SEARs in Different Firearm Types
  8. 02:44Universal SEAR Principle
  9. 03:17Visualizing the SEAR and Hammer
  10. 03:42Trigger Interaction with SEAR
  11. 04:16Detailed SEAR and Spring Mechanics
  12. 04:35Hammer Lip and SEAR Catch
  13. 04:47SEAR Interaction During Cocking
  14. 05:03Trigger Bar Releasing SEAR
  15. 05:13Recap: SEAR and Hammer Fall
  16. 05:35SEAR Mechanism Simplicity
  17. 05:46Trigger Pull and SEAR Tension
  18. 06:00Trigger Return Spring
  19. 06:13Concluding Thoughts on SEARs
  20. 06:20Encouragement for Asking Questions

Frequently Asked Questions

What is the primary function of a SEAR in a firearm?

The primary function of a SEAR (Sear) in a firearm is to hold the cocked hammer or striker back, preventing it from falling forward until the trigger is pulled. It acts as a critical link between the trigger mechanism and the firing system.

How does the SEAR interact with the trigger?

When the trigger is pulled, it actuens a component (often a trigger bar) that pushes against the SEAR. This action overcomes the SEAR's spring tension, causing it to disengage from the hammer or striker, allowing it to be released.

Are SEARs only found in single-action firearms?

No, SEARs are fundamental components found in a wide variety of firearms, including semi-automatic, double-action, and striker-fired systems. Any firearm that uses a trigger to release a spring-loaded firing pin or hammer will have a mechanism analogous to a SEAR.

What contributes to the feel of a firearm's trigger pull?

The feel of a firearm's trigger pull is significantly influenced by the SEAR mechanism. Specifically, the tension of the SEAR spring, which the shooter must overcome to release the hammer, is a major factor in determining trigger pull weight and feel.

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