Anybody know where I can get one?

Needs to fit a 99F, and must have that swelled area just under the dovetail for rear sight. I think they call it a "boss", the swell in the barrel there?

I am going to re-barrel that 243 that has the wrong barrel on a 250 gun. I will first send the info to the research guy to confirm that it is factory mistake.

Unless you guys think it has more value as a documented factory mistake?

Again, anybody know where I can get one of these, from a parts gun or something?

Thanks!