Ah yes, the 740 Jam-O-Matic, a classic. My brother has one, and it hasn't been fired in probably close to three decades because it can't empty a magazine without jamming. It was inherited, and he has other preferred rifles so he never bothered to have it repaired. A repair on these rifles is only a temporary fix, and the jamming problem with re-appear in short order.

Do a search for Remington 740/742 problems and you will have some good reading.

“I left long before daylight, alone but not lonely.”~Gordon Macquarrie