Yes they do mate (the cut out).
I have four Brno's and four sets of Warne mounts.
I dont have any trouble with them at all and if I were to buy another scope it would go in the Warne mounts as well.
I like useing my open sights a lot so my scope goes on and off quite often and I never worry checking the zero as they have never let me down.

Cheers Neale.