I would say stay away from the cheap $20 china made sights, for both the irons and red dots. We just had a few threads on here about the same things. I ended up with a magpul mbus gen 2 rear sight, and the midwest industries front sight. very happy with both. As for the red dot I have a vortex strikefire red dot. I am very happy with the red dot for the money I will say that the aimpoint dot is clearer then mine but not that much more for double the price.