Occasionally, the firing pin and hammer are external and can be pulled aback of the bolt action. When the trigger is pulled, the sear is disengaged from the bent and the hammer moves forward and strikes a small pushrod (firing pin or striker). When the weapon the weapon is cocked (ready to be fired), the hammer has been pulled back against a b spring and is held back by the end of the sear, which rests in a notch known as the bent. The block is pierced in its centre to accommodate the firing pin which is actuated by a spring and moves forward when trigger is pressed. When the weapon is closed for firing, the barrel comes into position against a flat block of metal called breech face, which seals the breech end of the chamber. The bolt or the block can be opened to insert a fresh cartridge into the chamber. It consists of a receiver which contains a bolt or block which closes and locks. A breech action is attached to the barrel at the breech end to close the end of the barrel. (1) The chamber, at the breech end to accommodate the cartridge, which is usually of large size than the bore, (2) the taper, called lead or leed in rifled arm and chamber cone in a smooth bore, connects the chamber to the bore, and (3) the bore, which lies between the taper and the muzzle. The inside of the barrel consists of three parts.
General make-up and Mechanism: Firearms consist of a metal barrel in the form of hollow cylinder of varying length, which is closed at the back end and is called the breech end and the front open end is called the muzzle end. A firearm is any instrument which discharges a missile by the expansive force of the gases produced by burning of an explosive substance.įorensic Ballistics is the science dealing with the investigation of firearms, ammunition and the problems arising from their use.
0 kommentar(er)
