I'd get a fast fire three with a 8 MOA dot or a FF2 with a 4 MOA

The three does have a few nicer features and remember that 1 MOA is roughly 1inch at 100yrds. So if it's 8 MOA it's will be 4 MOA at 50. Or about a four inch dot.

You can always shop around and get the sight model you want then order the base you want. The. You get exactly
What you want