The 4" barrel Model 10 was the standard-issue service revolver configuration for American law enforcement throughout the 20th century. Millions were carried by police officers across the United States from the 1900s through the 1990s transition to semi-automatics. Type: Revolver Action: Double-Action Caliber: 38 Special Capacity: 6 Year introduced: 1899, USA Weight: 30.5 oz Overall length: 9" Status: Active Military use: Yes Intended use: Service / Law Enforcement