bob im trying to get some information on the cf conversion you showed on the forum talked to mark and he said to contact you.the win cf firing pin looks like a 1873 with the retractor in the bolt my question is did win machine the inside of the bolt to fit the profile of the firing pin?also what about the headspacing after the conversion.i realize the firing pin length is also a trial and fit procedure.hope you can help clarify these requests.thanking you in advance for any information you can give me.hope to hear from you gen66.