Thinking about getting one... Does anybody have one and how do you like it... Also what caliber???

i dont know what a custom KS mountain version is. but i got a model 700 ADL and I love it. tis in teh .270 caliber, shoots good, easy to clean and gets er done. if i were to have had a choice in teh gun again, i would have opted for a stainless version, so i wouldnt worry about rust as much. but the REM model 700's are good guns to go with IMO

im not familiar with the custom ks mounatin either, but I have a rem 700 mountain rifle in .308 win. I absolutely love this rifle and would never get rid of it. its a light compact gun that handles very well in the woods and is very accurate considering it has a toothpick for a barrel. All but 2 deer I have killed in my lifetime were with my mountain rifle, Ive taken one elk and many coyotes with it too. out of all my rifles it would be my go to gun theres nothing it wont handle.