Murphy's Law says the safety will be on the first time your life is depending on it being off!
As someone who has carried a USP variant 1 for at least 4 years total this is pure crap. It will never "turn itself on". The detent is pretty stiff. It's not going to get engaged unless you engage it. Even with lube in the detent plate it won't easily do it.
The USP system has a lot of faults with it, but "having the safety accidentally engage itself" on a variant 1 gun is not one of them. I mean by the parts if you want, but frankly it's a waste of time and money, and it actually reduces the value of the gun. So when you go to sell the thing (and you will, eventually, just like that AT&T ad from 1993) the guy buying it is going to want the Variant 1 plate put back in the gun, lol)
-Mike
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