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.