While not a factory Mountain Rifle it does have a McMillan Mountain Rifle stock.
23" 9 twist Shilen #2 in 280AI. Metal is nitrided.
7 lbs 2 ounces with a 3.5-10 Leupy in Talley LW's.
I put this together 10 years ago along with a near matching left hand version for my son.
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]

"after the bullet leaves the barrel it doesn't care what headstamp was on the case"
"The 221 Fireball is what the Hornet could have been had it stayed in school"