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Norme · 12-18-2009, 10:32 AM

I believe Vlim is correct, and that the grooves were to prevent the firing pin from binding due to a build up of powder residue.This probably became an issue with the introduction of steel cased ammunition which did not seal as well as brass. This fix was not new,as you can see from the cylinder pin from a Colt 1851 Navy. Regards, Norm

12-18-2009, 10:32 AM	#3
Norme Always A Lifetime Forum Patron Join Date: Jul 2009 Location: Colorado Posts: 2,417 Thanks: 226 Thanked 2,607 Times in 933 Posts	I believe Vlim is correct, and that the grooves were to prevent the firing pin from binding due to a build up of powder residue.This probably became an issue with the introduction of steel cased ammunition which did not seal as well as brass. This fix was not new,as you can see from the cylinder pin from a Colt 1851 Navy. Regards, Norm Attached Thumbnails