Charlie, Poyer's book states left, but Brophy states right side of base. Since the bases for the '98 & '02 are basically the same with different leafs. The difference in the base for the carbine is the height of the base. The '96, '98 & '02 carbine has the C on the right side and '01 it is on the left side. According to "The Krag Rifle" by Lt.Col. William Brophy. Now that the new photos have been added, one can see the back of the sight. Your call, John