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Another thing to consider is the weight of the ammo loaded into a magazine. Note that the B.A.R. magazine held only twenty rounds. There is a limit as to how much weight a magazine spring can push up to function correctly. More than twenty rounds, they used gravity to supply the rounds, i.e. the Bren with the magazine on top of the gun, and the Sten with a magazine out to one side. And then there are drum magazines. But a box magazine under the gun could be problematic.
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