Have any members taken a shot or two with one of these U/O express rifles?

I found one on the shelf of an interstate gunshop in .45/70 at a very attractive price however there was no info on what loads it is regulated for, no means of user adjustable regulation and no data warning to only use 30,000 psi or less loads

http://www.faustistefanoarms.com/cat_scheda.asp?id=221