Yes there is a possibility of it getting worse. there are a few things you can do.
(1.If the gun is a new one take it back to the selling dealer and ask them to contact Remington for a fix under warranty.

(2. look into buying a new fore end thru a company like Brownells.

(3. Fill the crack with a good wood working epoxy to seal it from the weather and also put a stop to farther cracking.


I would go with number 1 my self and number 3 if there isn't a warranty.

Al