Bargain for solid, entry-level rds (disclaimer: this one is green!!) - SIG SAUER OPMOD Exclusive Romeo-MSR 1x20mm 2 Red Dot Sight

Purchased this as my first RDS (technically THIS ONE is a Green Dot) for my first optic ready AR-15. I couldn't be happier.

The price-point would deter many people no doubt, being less than many other entry-level, US-made designs, but Sig Sauer is a reputable producer of optics, and this micro RDS is very much in line with their history.

The construction is beefy & solid.
I've put a few hundred rounds through it after taking it on and off to adjust my Iron Sights and it has held zero flawlessly - I pegged soda cans at over 100 yds my second time shooting my rifle setup.
Seeing through the cover caps is a plus for me.

The absolute co-witness mount it comes with is great to practice with my Iron Sights as well.

I've seen other people complain about the NV settings not working. I don't run a NV setup so can't confirm, but I can see the LED light turning on (very faintly) for my NV settings when i'm in a dark room so I know it works turns on. It might just be a compatibility issue (but again this is where lack of NV setup can nullify my statement.)