SACRAMENTO, Calif. (AP) ¿ GenCorp Inc., which makes aerospace and defense products, said Tuesday it will offer up to $125 million of convertible subordinated notes in a private transaction aimed at refinancing other debt. Shares fell amid a broader market pullback. GenCorp expects to give the initial buyers of the notes the option to buy an additional $18.75 million in notes to cover any overallotments. The notes will be convertible at a rate and price the company has not yet determined. Interest on the notes will be paid twice a year. The notes will mature on Dec. 31, 2039. Shares of GenCorp, based in Sacramento, Calif., fell $1.04, or 12 percent, to $7.41 in midday trading.