The Colt Model 1903 Type IV (introduced 1926) added the internal hammer-block safety to the original design, providing a passive drop safety alongside the existing grip and thumb safeties. This final production type ran until 1945. General officer-issued Type IV guns are identifiable by US Property markings and were among the most refined versions of the design, benefiting from four decades of production refinement. Type: Pistol Action: Semi-Automatic Caliber: 32 ACP Capacity: 8 Year introduced: 1926, USA Weight: 24 oz Overall length: 6.75" Status: Discontinued Military use: Yes Intended use: military, law_enforcement, collector, concealed_carry