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Published on November 15, 2025
Duration: 2:18

This guide details a common firearm malfunction where the hammer fails to fully strike due to excessive trigger play. Expert instruction from Vampire Guns demonstrates how to diagnose the issue by examining wear marks on the trigger cage and sear/disconnector spring. The solution involves a precise modification of the trigger cage to correct the contact points, ensuring reliable hammer function.

Quick Summary

A pistol's hammer not fully striking is often due to excessive trigger play. This vertical movement can cause the trigger bar to lift, disrupting the disconnector's contact with the sear/disconnector spring. The fix involves carefully chamfering the lower edge of the trigger cage to eliminate abnormal contact, ensuring reliable hammer function.

Chapters

  1. 00:00Introducing the Firearm Issue: Hammer Not Fully Striking
  2. 00:08Hammer Stopping Mid-Cycle (Half-Cock)
  3. 00:13Diagnosing Trigger Play and Normal Wear
  4. 00:24Impact of Trigger Play on Firearm Function
  5. 00:39Disconnector Interaction Problem Explained
  6. 00:46Evidence of Abnormal Contact on Sear Spring
  7. 00:58Trigger Pull Sensitivity and Sear Reset
  8. 01:23Solution: Modifying the Trigger Cage
  9. 01:40Showing Trigger Cage Before and After Modification
  10. 01:50The Chamfered Trigger Cage Explained
  11. 02:00Reassembly and Expected Fix Confirmation

Frequently Asked Questions

Why would a pistol's hammer stop halfway during reset?

This issue, where the hammer stops mid-cycle, is often caused by excessive vertical play in the trigger. This play allows the trigger bar to lift slightly, disrupting the proper contact between the disconnector and the sear/disconnector spring, leading to an early sear reset and hammer stop.

How does trigger play affect firearm function?

Trigger play, especially vertical movement, can cause the trigger bar to lift. If this lift is significant, it can disengage the disconnector from the sear or its spring. This loss of contact can prevent the hammer from being held back properly, resulting in malfunctions like the hammer not fully striking.

What is the correct fix for a hammer not fully striking due to trigger play?

The recommended fix involves modifying the trigger cage. Specifically, chamfering the lower edge of the trigger cage where it makes abnormal contact with the sear/disconnector spring can resolve the issue without negatively impacting the disconnector's primary function.

What are the signs of abnormal contact in a pistol's trigger mechanism?

Abnormal contact can be identified by wear marks on internal components. For instance, the sear/disconnector spring ('triple') might show a faint mark from contacting the trigger cage, in addition to the normal contact mark from the disconnector.

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