- 01: Introduction
- 02: History
- 03: Propellants, Firearms, and Ammunition Development
- 04: Modern Firearms Manufacture
- 05: Small Arms Ammunition
- 06: Evidence Handling Procedures
- 07: Equipment and Instrumentation
- 08: Examination of Firearms
- 09: Cartridge and Shotshell Examination
- 10: Characterization and Evaluation of Fired Projectiles
- 11: Bullet Comparison and Identification
- 12: Gunshot Residue and Distance Determination
- 13: Toolmark Identification
- 14: Communicating Results
- Resources
Modern Single-Action Revolvers
Home > Examination of Firearms > Handguns > Single Action Revolvers > Modern Single-Action Revolvers
Ruger revolver transfer bar
Modern single-action revolvers generally include an integrated safety feature to prevent accidental discharge. For example, Ruger revolvers use a transfer bar safety. This involves the use of a bar connected to the trigger. When the trigger is pulled, the bar is raised up to be struck by the falling hammer, transferring the energy of the hammer to the firing pin. Without the trigger being pulled, the hammer will not make contact with the firing pin.
Outline diagram of a single-action revolver handgun with hammer block highlighted and labeled.
Some single-action revolvers use a hammer block safety which, in the safe position, blocks contact between the cartridge and the hammer. When the trigger is pulled, the bar is retracted and the hammer is allowed to make contact with the firing pin, striking the cartridge.
