that auction starts at 200$. gonna guess it will go for a little more. it uses the wideview scope mount. ive used them in the past. it uses just the sight screw holes. your barrel doesnt need the rear hole with that mount. its not as snug as the thompson center mount base but works fine especially if you dont have the rear hole tapped. it has the see through rings so hammer clearance isint an issue but you may need a cheek pad to raise your eye up a little. looks like its never been shot to me. sometimes i have gotten great deals on guns only to have them sit in the cabinet. in my case the nearest shooting range is like an hour away and busy on the weekends so other guns take priority some years.