This is a replica EOTech EXPS holographic sight intended for PTS (Professional Training and Simulation), Airsoft, or in my case 22LR use. Might be fine with .223/5.56 but I only had it on a small 22LR and it “played the part” nicely. Clear indicator that it is not “the real deal” is that the reticle is actually illuminated, not an etched reticle like a real holographic sight. You can also switch from red to green reticle, which you cannot do on the real ones but is kind of cool for a 22LR setup (red for lower light conditions, green for daytime bright conditions — or change based on what color your laser is, change to green if you’re running a really strong light to combat washout, etc.) Comes in excellent used condition as shown in the photos from a smoke-free home. Local Idaho Falls area meet up only.