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Most of them in the surplus stores will have the lower outside corners worn and torn out. You might get lucky and find a new old stock example. Not good for just any magazine because the 30 round FN C2 magazine is about 3" longer than a standard.
My dad used to use one. He said loved it just because when he didn't have the C2, he still had the 30rd magazines to rock into the C1 (giving him significantly more firepower than his buddies with there 20rders).