Typical troy buis with a catch - Troy Tritium HK Top Mounted Deployable Iron Sight

Catch is the Tritium is indeed a little "under powered" in comparison to a few other brands I have experience with. The Troy BUIS themselves are just as good as the non-tritium ones, some of the best in the industry. If you are running your eye close to the rear site expect the rear Tritium to be fuzzy close in. Setting the rear all the way back to maximize accuracy between the front and rear may leave something to be desired utilizing the rear Tritium. Rifles with a longer butt-stock will benefit from these. Keep in mind the small hole on the rear does not have Tritium like the larger. Would be a waste if it was anyway but it is worth noting.

I would recommend them overall.