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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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Extractor is definitely one (they are know to fail), firing pin assembly another and the cocking lever is another (depending on generation, there were some that broke easily).
Thanks for your help.
Recoil spring assembly. 50 bucks at Brownells. My first one died after 3k rounds.

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Thanks. I will definitely add it to the list.
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