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After considerable testing and discussion,
we have concluded that the proper answer for a pistolero whose eyes
have begun to go is not a pistol ghost-ring, but rather a pistol
express sight. The express sight, as you know, was pretty standard
on the British heavy rifles of the Great Days. It consisted of a
shallow "V" rear sight, mounted well forward on the barrels, in
combination with an ample round bead on the front.