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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).
You are welcome. You might want to look for these at Brownell's, which has better prices than some well know dealers. Of course, you can also go directly to HK.
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