Welcome to the forums. You can contact HK Customer Service and request the modification. Optionally, you can contact HKParts.net as they are H&K Certified Armorers for the USP and should also stock the parts. As for a "tune-up", not necessary unless you are in excess of 15,000 rounds or are experiencing a specific problem. Most components however, have a 25,000 round service life before suggesting change.



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