I'm not finding the Performance Center PPC-9, a non-cataloged 5906-based gun only available on special order from LEO's, on letterhead. Mine is a 6", but I believe 5" was also an option, and stainless.

Aristocrat rear sight, and spherical barrel bushing.

Not even listed in my copy of "Blue Book"...very limited sales due to LEO-only restriction...I had to sign agreement to not re-sell within 12 months from delivery, which was 18 months since order. I ordered 2, but sold-off one to fund a pair of new 952s.