Trijicon HD XR's
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I'm partial to TruGlo TFO's. Bright at night AND during the day. I like the green / red combo. Red front post, green rear. Have them on my XD and XDS, getting ready to order them for my shield.
Just like cmshoot said about the XS Big Dots, find somebody that has these and try before you buy. Buddy had them on a Glock 17, all the dots/spikes/whatnots around the ring make it VERY busy and distracting. They're also big/awkward as far as carrying and drawing the gun. Seems like a cool idea, but too much going on for my liking.