Firearms Facts Episode 27: Full Auto Single Action Revolver

Published on September 1, 2013
Duration: 5:56

This episode delves into the mechanics of a full-auto single-action revolver, explaining how a missing firing pin bushing can cause rapid, unintended firing. It also details the risks of using +P ammunition in firearms not rated for it, highlighting potential frame stretching and accelerated wear, using examples like the Charter Arms Southpaw and older Smith & Wesson models. The video emphasizes understanding firearm limitations and choosing appropriate calibers over over-pressuring existing ones.

Quick Summary

A missing firing pin bushing in a single-action revolver can cause 'full auto' fire as primers blow back, resetting the hammer. Using +P ammunition in non-rated firearms risks frame stretching, accelerated wear, and mechanical failure, especially in lightweight alloy models.

Chapters

  1. 00:00Intro: Full Auto Revolver & +P Ammo
  2. 00:20Understanding +P Ammunition
  3. 01:35Charter Arms Southpaw & +P Risks
  4. 02:02Frame Stretching & End Play Explained
  5. 03:16Vintage S&W Hand Ejector
  6. 03:40How a Full Auto SA Revolver Happens
  7. 05:06Conclusion & Safety Advice

Frequently Asked Questions

What causes a single-action revolver to fire in full-auto mode?

A rare cause of full-auto fire in a single-action revolver, like a Colt SAA, is a missing firing pin bushing. When fired, the primer can blow back through the hole, pushing the hammer back and cycling the action repeatedly until the ammunition is depleted.

What are the risks of using +P ammunition in a firearm not rated for it?

Using +P ammunition in firearms not designed for it can lead to accelerated wear, frame stretching, increased recoil, and potential mechanical failure. Lightweight alloy frames are particularly vulnerable to damage from these higher-pressure loads.

How can frame stretching affect a revolver's function?

Frame stretching, often caused by excessive pressure from +P ammunition, can lead to increased cylinder end play. This excessive play can result in light primer strikes, causing misfires and compromising the firearm's reliability.

Is it safe to use +P ammunition in a Charter Arms Southpaw revolver?

The video suggests caution, noting that the Charter Arms Southpaw's lightweight alloy frame can be stretched by +P ammunition, potentially leading to mechanical failure. It's advisable to use standard pressure loads or consider firearms specifically rated for +P.

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