S&W 1917 Cylinder Swap and time.....Anvil 0110

Published on February 18, 2022
Duration: 41:09

Mark Novak, an expert master gunsmith, provides a highly technical guide on modifying a Smith & Wesson 1917 revolver. The process involves swapping the cylinder to properly headspace .45 ACP cartridges without moon clips and correcting timing issues through precision stoning. This detailed procedure highlights advanced gunsmithing techniques and the importance of understanding internal mechanics for reliable firearm function.

Quick Summary

A Smith & Wesson 1917 revolver can be modified for .45 ACP headspace without moon clips by swapping to a cylinder with stepped chambers. This modification allows the rimless .45 ACP cartridge to headspace on its case mouth. The process involves detailed disassembly, fitting the new cylinder, and correcting timing issues through precision stoning of internal components.

Chapters

  1. 00:00Project Introduction
  2. 00:56Headspacing and Moon Clips
  3. 02:21Frame Disassembly
  4. 05:14Internal Mechanics and the Strain Screw
  5. 06:50Trigger and Hammer Removal
  6. 08:38Bolt and Plunger Assembly
  7. 12:21Cylinder Disassembly
  8. 14:40Fitting the New Cylinder
  9. 17:50Correcting Timing Issues
  10. 19:00Live Fire Testing

Frequently Asked Questions

How can a Smith & Wesson 1917 revolver be modified to properly headspace .45 ACP cartridges without moon clips?

A S&W 1917 can be modified by swapping its original straight-through drilled cylinder for a new-old-stock cylinder featuring stepped chambers. These stepped chambers provide a physical stop for the case mouth, allowing .45 ACP cartridges to headspace correctly without the need for moon clips.

What are the key steps involved in a S&W 1917 cylinder swap and timing correction?

The process includes frame disassembly, careful removal of internal components like the hammer and trigger, cylinder disassembly, fitting the new cylinder, and correcting timing issues by modifying bolt windows or the bolt with precision stoning until perfect lock-up is achieved.

Why were moon clips originally necessary for the S&W 1917 when firing .45 ACP?

Original S&W 1917 revolvers had straight-through drilled cylinders. Since .45 ACP is a rimless cartridge designed to headspace on the case mouth, moon clips were required to hold the cartridges in place and provide the necessary headspace for proper function.

What common mistakes should be avoided during S&W revolver disassembly?

Avoid prying off the side plate, as this can cause damage; instead, use vibration and tapping. Also, handle delicate parts like the bolt spring and plunger with extreme care, avoiding force to prevent breakage.

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