Almost anytime I buy a MLOK product, usually magpul, I think, it comes with a brown tannish caked on thread locker.
I don't think loctite makes any of that color so I'm wondering what is being used, and what the equivalent loctite is. Blue, I'd guess?
Also, it seems caked on. Makes me wonder if I should be applying wet loctite and letting the screw sit for a few hours or a full day even to let it cake in there before I install it.