I have a small rare earth magnet and it's extremely powerful. To use one to hold something to your kit would be silly. It will grab onto anything it can and will collect any and all metal materials. If and when you removed your shotgun from your kit that magnet will attach itself to anything you might walk near. I's sure would not want to "be that guy" that had a rare earth magnet on when someone threw a grenade or a flashbang past me and the magnet grabbed it...... they are that powerful.
Edit to add: It's also got to make noise to remove a shotgun from the magnet, another reason I think it silly to use.
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