I just borrowed my friends 15+ year old usp and was thinking of showing it a little love,it is still bone stock, what should be replaced in it?springs, etc? thanks
Trigger return spring
Firing pin block spring
recoil spring
extractor spring
roll pin 3 X 14mm HK suggests to replace these EVERY time you knock one out they should be replaced with a new fresh pin.
Mag springs (super common issue)
O-rings (if your firearm uses them)
There may be more but this covers the main wear and tear components. I hope this helps.
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