Their catalog answers many questions that the website does not.
What is the difference between the 100 and 103?
Windage adjustment. You get 44 MOA on the 100, 88 on the Buffalo.
(406) 388-4027 ext 1151 for sights -- they are in Belgrade, Montana
I placed an order for the 103. A person might make different choices if they were going to be carrying this in the field for hunting. Saving some money could lead to other choices.
It is common to remove the sight while transporting the rifle. I screwdriver will do the job, although they do sell a dedicated tool for this purpose.
For one of their sights, the claim that it is "ideal for BPCR silhouette". "What is BPCR?" you might ask. It is "black powder cartridge rifle" and is a shooting sport that involves shooting black powder rifles at animal silhouettes cut from steel plates.
For less money (and less quality) people mention "Marbles" sights (see Midway) as well as Taylor's and company.
Here is a video where a guy puts one on his Sharps:
Tom's Computer Info / tom@mmto.org