The PSC is probably not a typo but someone' s misunderstanding of the PSE logo with the arrow through the letters. The PSE web site has a listing of all their bows, new and old. It shows the XLR 900 Infinity as a 1996 bow, but does not have a link to any info on it. I did a quick search in the PSE message board and found one thread from 2002 about the bow. It gave me the link to the list of bows and there was one individual that had a lot of good to say about the bow.