There should not be a lot of vertical play once the mag is inserted and "clicks" in. The mag catch may be worn, and 1/4" is totally unacceptable. It could also be the case that the aftermarkets are a crappy brand and their springs as well as that of the WWI mag are tired out. But I'd address the looseness of the mag first.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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