I have used a Marbles-Goss receiver sight on a .45 cal. heavy m/l "buffalo rifle" for years. Have another, .54 cal., with a Redfield 75 mounted on it. Both were used for buffalo matches in m/l competition from heah' to Friendship.
Interesting thing about the Goss as compared to the Redfield. The threads are opposite on them. One turns clockwise to move right, for example, and the other turns counter-clockwise. I had to keep a notebook with all my sight notes in it to make sure I didn't move one the wrong way during a match.
The Goss is an extremely high quality sight, IMO, although I used an adjustable iris Merit disc on both it and the Redfield.
Stan