I have a new 527 Varmit in 204 Ruger on the way. This model does not come with scope rings. I am going to mount a Burris 4.5-14x42 on it. Finding rings to fit a CZ is not the problem, but what height do I need? While the objective glass size is 42mm, the actual outside diameter of the objective is 56mm according to Burris. Do I need high rings, or will medium do it? Thanks