I installed mine about 3 weeks ago. Their installation video is somewhat misleading in that they don't really show any fitting required for the rear sight but if you watch closely you'll see that skipped over on the rear but showed it in detail for the front.
The dovetail's base on the front & rear DXT2 sights each measured ~.010" wider (front-back measurement) than the factory sight's dovetail which would imply each would require similar amount of fitting but that's not what I found.
The front required a lot of filing to get it to fit 1/3 of the way in the dovetail & then was a snug fit to center.
The rear, for some reason, very quickly changed from too tight to a not very tight fit so make sure you go slow on it. It has a set screw & a center notch for it to tighten in to so it's still plenty secure.
Their video shows to add the supplied red threadlocker after the sights are fitted. I didn't see a need for that step plus wouldn't you use a wicking/penetrating green threadlocker for after assembly use if that was needed?
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