Built like a tank and very good quality glass - SIG SAUER Romeo8T Red Dot Sight 1x38 mm

This red dot is built like a tank and has super clear glass. It's the heaviest non-magnified optic I've used. I have a slight astigmatism and so I am very picky about red dot optics because the dot can appear to be smeared or have a starburst appearance. This optic isn't the worst, but it isn't the best for my particular eyes. It's certainly workable and not a show stopper. Again, that's more about my eyes than the optic. If you are looking for durability over weight - this is what you're looking for.