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Is it a NS2 System USP or the (older) Hardkick System USP?
Either one have a hammer assembly that is a huge pain to take out from the gun or to put it back. It is not like the Marui Glocks which you can replace the whole hammer assembly easily. To replace pretty much anything from the hammer assembly of a KWA/KSC USP you have to take almost everything out, and it is not simple.
I have some experience messing around with it and I have a scavenged (and working) NS2 System USP that can be used as a parts donor gun, for a same system (NS2) USP. If your want to try repair it yourself, there is some KWA USP disassembly videos out there, and if you run into specific problems such as some parts stuck, I can help you here, too. But if you want to save yourself some pain I should be able to do the work for you as well (I am relatively close to your area and I occasionally travel to Guelph). Also if you are interested in the parts donor gun you can PM me.
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