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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, 
hkmanlp1
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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hkmanlp1
veritas said:
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).
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Thanks for your help.
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hkmanlp1
MasterBlaster said:
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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