My BC date code USP9 had a pretty stiff safety out of the box, and it got even worse when I changed over to an ambi. What I discovered is that the grove the detent plate moves in on the safety axle had a few small burrs in it. I used a small jewelers file and removed the burrs. Now the safety engages, dis-engages and de-cocks smoothly. I'm disappointed that a 90 dollar part had to be finished, but the end result is exactly what I wanted. As a '94 run it could also just need a tear down and re-lube.
I am not an expert, nor do I play one on the internet.
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