The mountain guns are sold now as 'Stoking Dealer Exclusives'. The 25MG was preceded last year by the 5" half-lug 686+ with similar f-g squared cocobolo grips and a HiViz front sight and V-notch, while the 25MG had the standard blade/square notch sights. I am not sure about the 5" 60... it may be a regular stock item. My 'pusher' has one... I handled it earlier this week... cute little wood grips - more appropriate for a snubby, I feel. I won't be adding one to my collection.
Re the blued 25MG... if you want to break it in without personalizing that cylinder ring even more, you can do as I did with my new Heritage 24 last year. Remove the cylinder and yoke (front screw) and hold the cylinder release back, towards the hammer while you dry fire. The effort will be a bit less without the cylinder to move, but you will still need to swap hands regularly. If you are not squeamish about removing that sideplate (... and replacing it!), you could do so - and blast the innards with an aerosol cleaner, leaving some gun oil on the axles and slide-surfaces, before re-assembling and dry-firing. It will make a difference.
Yeah, I really am anal enough to preserve my 24's cylinder for real 'live' fire...
The 625 and 629 Mountain Guns I have are definite keepers... enjoy yours!
Stainz