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The upper receiver needs to be modified. The opening in the lower receiver is also too small. Ppl just usually convert them to a UMP lower and stock.

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You need to use a UMP lower because the USC lower is just too narrow to accept double stack UMP mags. You also need to modify the opening in the bottom of the receiver as described above. Bottom line, there is no way to just stick a UMP mag into a USC without modifications.
 

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