Greetings!
According to th Spencer book by Marcot, Spencer was close to Lawrence at the Sharps manufactory, and the first Infantry Spencer was, forward of the receiver, Sharps! Makes one wonder how 'easy' it would be to make a 56-56 CF Rifle using a new Spencer, Sharps parts, a chamber reamer, and a gunsmith...!
Be Well!
M.T.Marfield
1-12-06