This is a real (not an airsoft replica) eotech model 551 (it has the night vision compatibility the 511 doesn’t) it’s in really good shape for an older model. I’ve owned 9 eotechs now including a couple older than this and it works great. The reticle has a dim spot if viewed through the lower right portion of the optic window as do almost all older eotechs I’ve shot with. This ones very nice as indicated by the lack of scratching or signs of wear on the optic itself. I don’t think it was used before I received it. Will come with G&G lens covers pictured and eotech hard case. No trades pleas and price is firm