I am a fan of the AR332 on mine.
Nice circle to focus yor attention like a red dot.
Reticle illuminates to varying brightness of red or green.
Fixed three power to give you magnification without getting to high a magnification or too many controls to play with.
Fairly nice eye relief with a large 32mm lense.
A simple reticle useful beyond ranges you reuire, out to 600m.
Comes ready in a mount for a decent price.
Saves you having to clutter up the rail with a rds and a magnifier.