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What are the best parts to stockpile for a USC to UMP conversion?

723 Views 7 Replies 5 Participants Last post by  BravoSector1
Obviously other than mags. I have a USC to UMP conversion in jail right now. I was looking for a list of the top 3 - 5 parts one should have in regards to possible breakage down the road? Thanks for any help.
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