![]() The two main types of metallic cartridges used in modern firearms are centerfire and rimfire. Firing relies upon the transfer of momentum from the hammer to give the firing pin sufficient impact energy to cause firing.Īnimation of a Dreyse needle gun firing, with its peculiar needle firing-pin. This is a safety measure to prevent discharge from external forces such as a drop. Firing pins of this type are often too short to contact the primer when the hammer is resting against it. ![]() ![]() In semi-automatic firearms, this prevents premature firing from the inertia of the firing pin as the breech mechanism closes in the reloading part of the firing cycle. ![]() It may be termed a firing-pin return spring, since it returns it to the unfired position. A light firing-pin spring is often used to keep the firing pin rearward. It sits within a hole through the breechblock and is struck by the hammer when the trigger is "pulled". The rounded end ensures the primer is indented rather than pierced (to contain propellant gasses). The typical firing pin is a thin, simple rod with a hardened, rounded tip that strikes and crushes the primer. Note the rectangular impression left by the firing pin on the rimfire cartridge. Fired rimfire and centerfire casings, showing the impression left by the firing pin.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |