mainmech,
Anschutz, to my knowledge, is the only manufacturer of LH Fortner actions and I also believe this action is only available on biathlon rifles. My wife recently competed in the US Summer Biathlon Nationals this past August. At that match, there was only 1 LH Fortner (Anschutz). As I am a lefty I asked about it. It was bought used in West Yellowstone by a smith, also a world class biathelete, who specializes in biathlon rifles.
If interested, let me know and I will give you his email.
Burt