I have an old damascus double in 12ga. The lock-up is just a little loose but only with the forend removed, once the forend is in place the lock up is tight and seems without problems. I would say that without the forend there is about a .010 gap at the top between the barrels and the breech, with the forend in place it is tight. Does this need to be taken care of before shooting it?

Thank You,
John