357 Sig Conversion P99

I am very interested in this and I was wondering if anyone here has done this or if you know someone who has done this 357 conversion for the 40cal. The faq says that 2 people make them or did make them. Bar-Sto and Jarvis. These companies respective websites do not include info on this anymore so I am not sure if this is still availible and if so how many are out there? Would I have to buy these from a private party?

Just found a site with more info and test info.

Bar-Sto .357 Conversion