I'm pretty sure it's a KS. The serial number starts with a C which I believe signifies coming out of the custom shop. Both of my KS Mtns start with a C in the serial number. The stock and barrel profile look right for a KS. If you don't buy it I'll be sorely tempted to myself.
Wife has a 270 LH BDL with a recoil pad, serial # begins with a C. I don't know any reason it would have been a custom shop gun.
It is a late 80s or early 90s gun, I don't recall the exact date but it was made before Dupont sold the company in 93.
