Dawson sights require fitting, so I'm guessing you cocked up your part of the transaction?
The sight itself was fine and shot accurately with the factory adjustable rear sights with a six o'clock hold. But I gave it to Joe Blow gunsmith to install it. He had good recommendations, but he did shit job and probably was too busy wanking off to put red loctite on the set screw. The Hennings sights are pretty much idiot proof, so I went with those and installed them myself.