..but this it's an authentic MBUS rear sight. There are so many fakes out there, but at $34 on sale I jumped on it. I ordered the front for $32 ( they're both back to normal pricing already). I half expected to get a counterfeit, but sure enough, the rear is authentic and not PTS.  Slid right on to my KSG's rail and locked up tight.<br /><br /> Will review for the front when it comes in as well.