What tipped me off was two things: 1) the seller randomly refunded my money, no communication as to why, 2)I found that when I adjusted the eye relief the reticle jiggled. Otherwise it held groups just fine on my 308, though I wasn't blown away by the glass. A call into Leupold found three things: 1) the SN was fake, though formatted correctly, 2) the lettering within the gold ring on the front bell SHOULD be black but is instead white, and 3) the zoom nob rotates opposite vs a real Leupold.