People on the internet like to recommend blue Loc-Tite for everything. And sure enough if you’re going to use Loc-Tite, blue or weaker is better since it is easier to mitigate.
My personal opinion (based on conversations with gunsmiths as well as a Boeing engineer) is to never use Loc-Tite or any threadlocker on firearms or optics. With good screws properly threaded and proper pitch, torqued to specs, clean and dry, you don’t need it. The engineer basically told me that if you have to use threadlocker then the screws or the steel is junk and/or not properly threaded.