PMC bronze 55 gr FMJ. I have to buy all my own accessories so a light comes after a RDS. I see great in the dark anyways. I don't need a white light to compromise my night vision.
A light is used to identify your attacker. It's a compromise to not have one. I want to be 100% sure that dark figure is a bad guy, not a family member.
For an AR, a light is more important than a RDS.