Lone Star Funds is set to issue a mortgage-backed security backed by new nonprime mortgages, according to documents filed with the Securities and Exchange Commission this week. It will be the third MBS from the COLT shelf this year. AMC Diligence said it reviewed 486 mortgages with a total unpaid principal balance of $235.40 million for the planned MBS. The mortgages were originated by Caliber Home Loans, LendSure Mortgage and Sterling Bank & Trust ... [Includes two briefs]