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William Mason
Born (1837-01-30)January 30, 1837
Oswego, New York, United States
Died July 17, 1913(1913-07-17) (aged 76)
Worcester, Massachusetts
Occupation Inventor, machinist, gunsmith

William Mason (January 30, 1837 – July 17, 1913) was a patternmaker, engineer and inventor who worked for Remington Arms, Colt’s Patent Fire Arms Manufacturing Company, and Winchester Repeating Arms Company in the 19th century.[1]


Mason began his career as an apprentice patternmaker, eventually working in the arms industry for Remington Arms. While at Remington in 1865 he designed and patented a revolver ejector mechanism to eject spent cartidge cases.[2]


Mason left Remington Arms in 1869 to work for Colt as the Superintendent of the armory. Along with Charles Richards, Mason patented designs to convert percussion revolvers into rear-loading metallic cartridge revolvers. Those converted revolvers are identified as the "Richards-Mason conversion".[3] After working on these conversions, Mason began work on Colt's first metallic cartridge revolver in 1871: the Colt Model 1871-72 “Open Top” revolver. This was a completely new design and the parts would not interchange with the older percussion pistols. Mason moved the rear sight to the rear of the barrel as opposed to the hammer or the breechblock of the earlier efforts. The caliber was .44 rimfire and it was submitted to the US Army for testing in 1872. The Army rejected the pistol and asked for a more powerful caliber with a stronger frame. Mason redesigned the frame to incorporate a topstrap, similar to the Remington revolvers and placed the rear sight on the rear of the frame. The first prototype was chambered in .44 rimfire, but the first model was in the newest caliber known as the .45 Colt.[4]

The revolver was chosen by the Army in 1872, with the first order shipping in the summer of 1873 for 8000 revolvers.[4] After the success of the Colt Single Action Army and Colt's conversion of existing percussion revolvers to Richards-Mason conversions, Mason went on to design Colt's smallest revolver, "The New Line" in 1874. There were 5 variants, each differing in size and caliber, but all using a breechblock designed by Mason.[5]

While Colt had first developed the concept of a "double-action" revolver as early as 1857 and a patent was filed, it was never built by Colt. With increased competition from their British rival, Webley & Scott, Colt had Mason design a double-action revolver for them in 1877, the Colt M1877. Following this, Mason once again teamed up with Richards to produce a larger framed version, the Colt M1878 Frontier in 1878.[6]

His final design for Colt was the Colt M1889, a collaboration with Carl J. Ehbets for a revolver with a swing-out cylinder. Ehbets continued to perfect the idea for 7 years after Mason left Colt for Winchester.[6]


Mason left Colt to work for the Winchester Repeating Arms Company in 1882.[7] While he was originally hired to design a revolver to compete with Colt's revolvers, Mason eventually made working prototypes of many of John Moses Browning's designs.[8][9] One of his more notable design improvements was the Winchester Model 1886 rifle.[1] In 1885 he became the Master Mechanic at Winchester and held that position until his death in 1913.[10]

Mason was an inaugural member of the American Society of Mechanical Engineers[11] and over the course of his life he patented 125 inventions for firearms, ammunition, firearm manufacturing machinery, steam pumps and power looms.[10] Winchester historian Mary Jo Ignoffo called Mason, "one of the most significant designers of the nineteenth century".[9]


  1. 1.0 1.1 Flayderman, Norm (2007). Flayderman's Guide to Antique American Firearms and Their Values (9 ed.). Iola, Wisconsin: F+W Media. p. 310. ISBN 978-0-89689-455-6. 
  2. Ware, Donald L. (2007). Remington army and navy revolvers, 1861-1888. UNM Press. p. 231. ISBN 978-0-8263-4280-5. 
  3. Arnold, David W. (2004). Classic Handguns of the 20th Century. Krause Publications. p. 16. ISBN 978-0-87349-576-9. 
  4. 4.0 4.1 Taffin, John (2005). Single Action Sixguns (2 ed.). Iola, Wisconsin: Krause Publications. pp. 38–39. ISBN 978-0-87349-953-8. 
  5. Walter, John (2006). The Guns That Won the West: Firearms on the American Frontier, 1848-1898. MBI Publishing Company. p. 171. ISBN 978-1-85367-692-5. 
  6. 6.0 6.1 Kinard, Jeff (2004). Pistols: an illustrated history of their impact. ABC-CLIO. pp. 163–164. ISBN 978-1-85109-470-7. 
  7. Boorman, Dean K. (2001). History of Winchester Firearms. Globe Pequot. pp. 52–54. ISBN 978-1-58574-307-0. 
  8. Wilson, RL (2007). Winchester: An American Legend. Chartwell. pp. 76–77. ISBN 978-0-7858-1893-9. 
  9. 9.0 9.1 Ignoffo, Mary Jo (2010). Captive of the Labyrinth: Sarah L. Winchester, Heiress to the Rifle Fortune (3 ed.). University of Missouri Press. p. 54. ISBN 978-0-8262-1905-3. 
  10. 10.0 10.1 Roe, Joseph Wickham (1916). "The Colt Workmen - Pratt & Whitney". English and American Tool Builders. New Haven: Yale university press. pp. 173–174. 
  11. "Error: no |title= specified when using {{Cite web}}". American Society of Mechanical Engineers. 1881. Retrieved 19 November 2011. 

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