This is a REAL STEEL ACOG. NOT AIRSOFT. However, I use it for both for the time being. This particular sight was used for testing instead of true combat, therefore it has no markings/stamps. The seller I got it from had said it was from their father who worked in weapon testing, and was able to get it from him. I traded a number of rifles+cash, totaling about $550 in value. I’ve used it for my real steel 5.56 AR-15 and it stays on target even after a full day of shooting. Very well made, very solid design. Red/Green illuminated reticle. I’m honestly not sure I want to sell or trade it, but I’d like to see what’s out there as my particular style of play is more by feel than by aim, although when I do use it it functions fantastically. Looking to trade for GBBRs. SCARs will take priority, but I’m never gonna turn down looking at them! I’m fairly easy, make an offer! Worst I say is no and then talk about other airsoft related stuff.