They do. It's called the peq-16. You just (likely) aren't special enough to have one. Neither am I (personal or issued).
I see your dilemma now, before I was looking at the problem objectively.
You could in theory make your own sight in target using graph paper for 10 yards and do it at home. You just have to be precise with your math and plotting.
Most members here tend to over think their setups and gear, so I try to provide a more real world sense. Too many haven't had the opportunity to stretch out to 400 yards at night with a laser and nv. I'm pretty good at this because I do actually know how weapons and sights work, so I can complicate the typical marine "it hit the target, it's good" mentality, to make it hit center mass, but I digress, you don't need my entire background history. If you care for it, pm me (not expecting you to).