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

Published on June 3, 2024
Duration: 13:06

The S&W M1917 revolver, adopted by the US Army in WWI, was a crucial sidearm chambered in .45 ACP. Its design evolved from the 'Triple Lock' and addressed the challenge of extracting rimless cartridges using innovative half-moon clips. This revolver saw service through WWII and was also adopted by Brazil, showcasing its enduring utility and historical significance.

Quick Summary

The Smith & Wesson M1917 revolver was adopted by the US Army in WWI to supplement pistol production. It addressed the challenge of rimless .45 ACP cartridges using stepped chambers and innovative half-moon clips for efficient extraction and reloading, seeing service through WWII.

Chapters

  1. 00:00Introduction to the S&W M1917
  2. 00:37Design Origins: From Triple Lock
  3. 02:05US Adoption & WWI Context
  4. 03:58Challenges with Rimless .45 ACP
  5. 05:48The Half-Moon Clip Solution
  6. 07:29Markings and Identification
  7. 10:35WWII Service & Brazilian Contracts

Frequently Asked Questions

What was the primary reason for the US Army adopting the S&W M1917 revolver?

The US Army adopted the S&W M1917 in .45 ACP during World War I because Colt's production of the M1911 pistol couldn't meet the demand for sidearms, necessitating a revolver that used standardized .45 ACP ammunition.

How did the S&W M1917 solve the extraction problem with rimless .45 ACP cartridges?

The M1917 used stepped chambers for headspacing on the case mouth and, crucially, employed half-moon clips. These clips allowed the revolver's star extractor to engage the cartridge base, enabling efficient extraction and significantly faster reloads.

What is the significance of the half-moon clip for the S&W M1917?

The half-moon clip was a vital innovation for the M1917, enabling it to reliably use the rimless .45 ACP cartridge. It allowed for rapid reloading, making the revolver practical for military service where speed and efficiency were paramount.

Where else did the S&W M1917 see service besides the US Army?

The S&W M1917 saw continued use in World War II by various US military branches and was also adopted by Brazil, which purchased 25,000 units in 1937, identifiable by a distinctive five-star crest on the sideplate.

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