Hammer (or tumbler): The hammer is propelled by the main spring within the gun and is not released until the chain reaction is set off. It is secured to the action body at one end and sits within the stock of a gun at the other.ĩ. Trigger plate: This component houses the trigger. This reaction consists of the trigger releasing the sear and subsequently the hammer, which allows the spring to release, which forces the hammer, via the striker, through the striker holes in the action body thus detonating the cartridge – which all takes a fraction of a second (much quicker than this explanation).Ĩ. Trigger: The trigger is pulled to set off the chain reaction that is the gun’s lockwork. Trigger guard: This is simply the guard for the trigger that attaches to the base of the trigger plate.ħ. On most over-unders it disengages the mechanism, leaving the trigger free to move but not fire.Ħ. Safety thumb piece: When in its safe position on side-by-sides, the thumb piece locks the trigger, stopping the gun firing. It is returned home by the top lever spring.ĥ. Top lever: The top lever disengages the bolt from the barrels, allowing the gun to open. Bolt: The bolt holds the barrels shut while the cartridge is shot. If the cartridge has been detonated, the extractors eject it.ģ. When the gun has not been fired, the extractor will simply pull the rim of the cartridge out of the barrel, making it simpler to remove. Extractors: Although difficult to see in the diagram, the extractors are the components that help release the cartridge from the barrels. ![]() ![]() For example, 12 pieces equals 12 bore, which is why a 20 bore is smaller.Ģ. The size denomination comes from one pound of lead divided into equal- sized balls that will fit the barrel. ![]() The barrels: Different sizes of barrel allow for different widths of cartridge, which in turn defines the gun’s gauge (ie. The parts of a side-by-side boxlock with side plates Parts of a shotgunġ.
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