Yes ok, but why does it appear to be a cap screw. What function does it serve?

eta: to elaborate, a simple recessed red dot would suffice for a safety indicator;however, this item appears to be designed to be turned in and out like a set/cap screw. I thought maybe it had something to do with the safety reset on/off.

I have not touched mine as I prefer the safety to stay off unless I put it on.

The above posted firearms are a very good value in my opinion. I love my 470