G-Rail Instructions
I've only installed HK G-Rails. I do not use thread locker of any kind on those models. The instructions don't say anything one way or the other, that I can find, about thread locker.
However, some rails, that use a similar lock up method, with helicoils to catch the cross bolts, specifically state
not to use thread locker, as removal can destroy the helicoils. The models with the dogbone nut are probably ok for thread locker, but I'd probably avoid it out of habit.
The two screw lockup system is very secure in my experience. But I've not fallen down a mountain with one yet, so YMMV.
A lot of companies use a similar lock up method, I'd imagine if there were issues, it would be bitched about on the internet and I've not seen anything.
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