- 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
Repeating Mechanism Components
Home > Modern Firearms Manufacture > Parts Fabrication > Low Stress Load Parts > Repeating Mechanism Components
Because repeating mechanisms vary greatly in form and function, it is difficult to generalize regarding their manufacture. However, one type of repeating mechanism (used in pump-action and semiautomatic shotguns) is uniform in design and manufacture. The major parts are one or two shell latches and the operating rod (or action bar) that connects the pump handle or gas cylinder to the bolt mechanism. Regardless of the manufacturer, fine blanking is the method of choice for these parts. Most are flat and can be made from sheet metal. Proper fine blanking can produce the needed protrusions that many such parts use to control shotshells position. Shell latches can leave identifiable marks on shotshells; the blanked edge of the latches often makes contact with shotshells.
