Sorry for the loss of your friend. The rifle is not a "Mountain Rifle" -- Remington Mountain Rifle synthetic stock had no checkering and (I believe) was Kevlar. This rifle looks like 700 BDL Stainless Synthetic with a spray painted standard synthetic stock and some nice engraving. Based on the cartridge (.260) my guess is that it was intended for coyote hunting/shooting. The scope is not particularly valuable. I'd guess the rifle at $750 to $800+.
NRA Life Member - RMEF Life Member - Vietnam Vet