Good red dot - SIG SAUER Romeo 4XT-PRO 1x20mm Reflex Red Dot Sight

Seems to be a solid optic and comes with a lot of features. The glass is some of the clearest I've seen which is expected from sig, the reticle options are extremely crisp with lots of brightness setting, and you do get a range of mounting options and lense covers. The only downsides I have found is the amount of halo effect when the brightness of the dot is high and it has a little of that looking through a tube issue that other red dots are known to have.