[fabsroman]

First off, you need rings that fit the scope you buy. All of my scopes are 1" scopes and I think the majority of them are. If you really want to get fancy and expensive, you can get a 30mm scope, which I might get for my next rifle.

Anyway, you have to start with the scope and work your way toward the rings. Which rings you use depend entirely on the scope. Now, an inch equals 25.4mm, so I don't know if those 26mm rings will work. In fact, I have never heard of 26mm rings and have only seen a few red dot scopes in 26mm's but they usually came with their own rings.

After you get the scope tube diameter straight, then you will need rings of that variety in the correct height to ensure that the bell of the scope clears the barrel of the rifle. You want the bell of the scope to be as close to the barrel of the rifle without touching it. So, the ring height depends on the scope bell. Obviously, a 50mm scope will have a much larger bell than a 36mm scope.

Oh yeah, the rings have to also fit the ring bases that fit on the gun. So, start with the ring bases that fit your gun, then find the scope you want and the rings that fit both the scope and the bases. Usually, the bases and the rings are a system kind of like Leupold's one piece or two piece base that use Leupold rings