Installing a tritium XS Big Dot on a ruger sp-101.

The red stuff is "gap filler" and they recommend that you fill the excess gaps with it (you'll see the front sight wiggle forward and backwards a bit before I pin it down). I didn't bother, and as far as I can tell it is just red thread locker. Let me know if you have any questions, after a while carrying and shooting with it, I will give a full review.

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