Thread: Bushing The Firing Pin Hole

Originally Posted by 300_BLK

What tangible difference does this actually make?

It is a vital safety issue in that it dramaticly reduces the chances of a ruptured primer. It is also important in some calibre coversions in order to reduce the firing pin diameter. Older firearms using lower-powered cartridges often have large diameter firing pins which are not safe with high-pressure cartridges (eg. converting BSA Martini 12/15's to .22 Hornet, M92 Winchesters to .357 Magnum, etc). High-pressure cartidges are able to overcome the spring pressure of large diameter firing pins and rupture through the pin hole (no, more powerful springs don't solve the problem!).