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Discussion Starter · #1 · (Edited)
Do UMP mags fit into the stock USC receiver? I'm just wondering if I can make the UMP mags work by doing the mod to the upper and use the UMP mags for now until my UMP lower for my swap gets here.

*Post Edit*

Nevermind, I looked closer at the UMP and USC lowers. I figured it out.
 
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