I purchased a BNIB S&W AR15, I am not a gun professional or anything so I caught the mistake a few weeks after I bought my rifle. I was looking around on the S&W website and saw that from factory the ar is supposed to be equipped with a flip magpul rear sight but for some reason my ar has a cheap piece of ---- rear sight that comes on the ar15-22 model. I was in touch with s&w last week to tell the about the issue. I was under the impression that they were going to send the replacement but they ended up emailing me a return shipping label to send the whole rifle to them! I'm just pissed b/c there is a fairly good price diff btwn the sights but I paid original price for the rifle. Sorry just a vent.