S&W M1917: A US Army revolver in .45 ACP

Published on June 3, 2024
Duration: 13:06

This guide details the specific technique for loading and unloading the Smith & Wesson M1917 revolver using half-moon clips, a crucial method for handling rimless .45 ACP cartridges in a revolver. It emphasizes safety and the efficiency gained through this system, as demonstrated by Ian McCollum of Forgotten Weapons. The M1917's design evolution from the Triple Lock and its wartime adoption are also highlighted.

Quick Summary

The Smith & Wesson M1917 revolver, adopted by the US Army in 1917, addressed WWI sidearm shortages. Evolving from the Triple Lock, it was chambered in .45 ACP and utilized half-moon clips for efficient loading and extraction of rimless cartridges, a key innovation for its military service.

Chapters

  1. 00:00Introduction to the S&W M1917
  2. 00:37Design Origins and the 'Triple Lock'
  3. 02:05US Adoption and WWI Context
  4. 03:58Adapting Rimless Cartridges
  5. 05:48The Half-Moon Clip Solution
  6. 07:29Markings and Identification
  7. 10:35Service History and Brazilian Contracts

Frequently Asked Questions

What is the S&W M1917 revolver?

The Smith & Wesson M1917 is a double-action revolver adopted by the US Army in 1917 to supplement the M1911 pistol during WWI. It was chambered in .45 ACP and evolved from S&W's earlier Triple Lock design, featuring a simplified frame for mass production.

How was the S&W M1917 designed to handle rimless .45 ACP cartridges?

The M1917's cylinder chambers were stepped to allow headspacing on the case mouth. However, to facilitate extraction of the rimless .45 ACP cartridges, S&W developed the half-moon clip, which held three rounds and allowed the revolver's extractor to function properly.

What are the key markings found on a S&W M1917?

Key markings include 'S&W D.A. 45' on the barrel, 'U.S. ARMY MODEL 1917' or 'UNITED STATES PROPERTY' under the barrel, and military acceptance marks like the 'Flaming Bomb' or inspector's initials (e.g., 'E.G.' for Lt. Col. Everett G. Hall). Brazilian contract models feature a five-star crest.

What role did the half-moon clip play in the M1917's operation?

The half-moon clip was crucial for the M1917's practical use. It held three .45 ACP cartridges, enabling faster reloading by allowing the revolver's extractor star to engage the clip for simultaneous ejection of spent casings.

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