They are my favorite scopes.
As good IMO as my NF NXS scopes, but lighter and lower.
The Alumina flip up covers are truly awesome, and you don't have to deal with the eyepiece turn as with NF scopes.
I just had 2 older MK4/M1s re-threaded for Alumina by the custom shop. It took them a couple months, but they did the job for ~$60ea without problems.
Mine are also fitted with custom crosshair reticles, either from Premeir, or the custom shop.
I predict you'll be happy with your scope.