I have a pack of tiny rare earth magnets, i dropped one and it stuck to the slide of my G19. this gave me the bright idea of putting a lot more on it. I put about a dozen of the magnets on the side of the slide and stuck the gun to the side of the fridge, the gun held fast right in the position i placed it and it was tough to pull off. I am going to use this as a way to mount my gun under a counter but first want to see if there are any negative effects of having these powerful magnets stuck to my gun long term?