Two possible problems
One has been mentioned, floorplates coming off. A connected problem is the seam on the body of the magazine failing - usually after more than one try - and the body actually 'coming loose'
A second type of problem with dropping a magazine is the feed lips being bent or distorted.
Neither probably are common in my experience, but I have a cringe problem with dropping a magazine on a hard surface, like a cement floor. Usually in practice or informal matches, 'we' use a piece of carpet or a soft(er) floor mat to ease the impact.
In serious self-defense? Magazines can be replaced.
One has been mentioned, floorplates coming off. A connected problem is the seam on the body of the magazine failing - usually after more than one try - and the body actually 'coming loose'
A second type of problem with dropping a magazine is the feed lips being bent or distorted.
Neither probably are common in my experience, but I have a cringe problem with dropping a magazine on a hard surface, like a cement floor. Usually in practice or informal matches, 'we' use a piece of carpet or a soft(er) floor mat to ease the impact.
In serious self-defense? Magazines can be replaced.