I have 10's in my Experts. I didn't put a gauge on them but it did seem to lower the pull a little. I haven't had a single malfunction with my USP's before or after the spring changes.
I don't know how light you want to go. The match kit comes with everything you'd need for a drop in trigger job. https://us.hkwebshop.com/HKWebShop/show/byItemID/10115//367///////////true
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