I love it! Always something new turning up.
Based on the rifles I checked and looking in the parts manual I would say that all of the 99-F's with the bossed barrel up to the million mark have the non-dovetailed barrel stud. The parts manual lists a seperate stud number for the 99-F's, only.
I didn't sample any rifles past the 1 million mark as I don't have enough rifles to confirm much. Just looking at the parts manuals I would say that it continued on with bossed barrels having the non-dovetailed barrel stud.
