A former Rockdale resident pleaded guilty on Friday to selling unregistered promissory notes as securities, bringing to a close a case that has been going on for several years. The charges against 61-year-old Ulys Randall "Randy" Riner stem from when he was owner and president of Express Factors, a factoring company that was originally based in Covington in the late 1990s.The business involved the factoring of government contracts. Riner would purchase accounts receivables of businesses that were performing government contract work at a discounted price.