I figured out earlier today that my USP Tactical's overtravel stop screw has been slowly working itself loose since I bought it. I reset the screw, witness marked it with red paint, and dry fired about 50 times before checking and seeing that, yes, it was in fact unthreading.
While it is thankfully unthreading towards "more overtravel" and not "gun doesn't go off," I do want to fix this. I'm assuming some threadlock will get it fixed in short order, but Loctite Blue specifically says not to use it in applications where metal is contacting plastic. What other options do I have for threadlocking such a tiny set screw?