I had a threaded barrel pistol. The protective cap kept unscrewing from the barrel while plinking. I did everything to try and keep it on there that didn't involve grabbing it with a pliers and cinching it down. All of them failed. I got to be so worried about the darn cap that it was affecting my shooting. I finally sold the gun.
Yes, I could have simply unscrewed the cap and put it in a "safe place", but I already got piles of that type stuff, heaped around my basement. It would have been lost in a week.