I think most benchmade dealers have extra screws. My local outdoor store had a bunch and replaced a screw that fell out of mine. My clip needs to be tightened every few months.
I’ve had a few clip screws come loose before on my Benchmade’s, spyderco’s and quite a few other knives. I just make it a habit of when I first get them to throw some blue loctite on and I’m good to go.
I do like BM knives in general, I’ve lost a couple BM folders because clip loosened and fell out of my pocket. Warranty doesn’t help if you don’t have the knife.