I had a set of the XS sights for a Rem 700. The ghost ring mounted on the rear of the reciever and the kit came with a test post for the front sight. The intention is that you use your own front ramp. Check out the Gen 3 front sight from Brockman's, it's pretty cool.
I quit trying to stuff all the features I wanted into a Mauser or Rem 700. I went ahead and got a Steyr and it is COOL. Waiting on the scope.