Good entry level optic - Holosun HS510C 1x0.91-1.2in Open Reflex Red Dot Sight

It's a decent optic, but it's overpriced compared to a sig romeo 5 which is less than half the cost and performs better. The 510C has IMMENSE parallax, but will still be just fine for most users. It's got great battery life and has solar backup power. It has 3 reticle options which are really great, no noticeable distortion or magnification. Minimal blue tint if that matters to you, very bright daytime setting as well as NV settings. Nice large objective/ window. All in all a nice red dot and it will get the job done.