Triggers and what they actually are: Anvil 0150

Published on August 7, 2025
Duration: 14:08

This video breaks down the fundamental mechanics of firearm triggers, explaining the critical roles of the sear, hammer, and their pivot points. It emphasizes the importance of geometry, particularly the 90-degree tangent relationship at the sear's contact point, and how this applies to both rotating hammers and sliding strikers. The instructor also highlights the physics of pressure and area in trigger components and the key adjustments for engagement, overtravel, and weight.

Quick Summary

Firearm trigger mechanisms fundamentally consist of three key elements: the sear (energy trapper), the hammer/striker (energy carrier), and their respective pivot points. The geometry, particularly the 90-degree tangent relationship at the sear's contact point, is vital for a clean break. Excessive material removal can compromise component integrity due to increased pressure.

Chapters

  1. 00:03:00Introduction to Trigger Varieties
  2. 00:47:00Basic Trigger Components: Sear and Hammer
  3. 01:14:00Trigger Geometry: The Triangle
  4. 02:16:00The 90-Degree Sear Tangent
  5. 03:38:00Horizontal Sears and Sliding Strikers
  6. 04:43:00Example: Peabody Rifle Trigger
  7. 05:26:00Example: Nagant Revolver Trigger
  8. 06:34:00The Importance of Metal in Triggers
  9. 07:02:00Pressure, Force, and Area
  10. 07:45:00Trigger Job Philosophy: Friction First
  11. 08:05:00Example: Smith & Wesson Triple Lock
  12. 09:16:00Trigger Adjustability: Winchester Model 70
  13. 11:25:00The Three Key Trigger Adjustments
  14. 11:46:00AR-15/M16 Trigger Comparison
  15. 12:25:00Triggers: Simple When Understood
  16. 13:18:00Universal Trigger Principles

Frequently Asked Questions

What are the three essential components of a firearm trigger mechanism?

The three essential components of a firearm trigger mechanism are the sear (which traps energy), the hammer or striker (which is trapped), and the pivot points for both the sear and the hammer/striker. The interaction point where they meet is also critical.

Why is the 90-degree angle important in firearm trigger design?

The 90-degree angle, specifically the tangent relationship of the sear's nose to the hammer's arc of motion, is crucial for a clean and predictable trigger break. This geometry ensures consistent energy transfer and prevents unintended movement or creep.

What happens if too much metal is removed from a firearm's trigger components?

Removing too much metal from trigger components weakens them and reduces their ability to absorb force. This can lead to component failure, increased pressure on remaining parts, and potentially unsafe firearm operation or malfunction.

What are the three main adjustments for a firearm trigger?

The three main adjustments for a firearm trigger are engagement (controlling creep or the distance the trigger moves before breaking), overtravel (the distance the trigger moves after breaking), and weight (the amount of force required to pull the trigger).

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