Once its off its off for good right?
Pretty much yes, You could refit it at a later date by warming it up again and pushing it back, however you would need to take great care and probably a few attempts to get it perfectley vertical again.
The removal of my forsight was permanant as it landed in the depths of my (very deep) garden pond!
However! Most hunting guns now lack standard "Irons, or Open Sights" now as fitting a scope is now pretty much standard for most people, especially hunters.
Tony
I guess i just need to make a decision whether to remove it and sell it with