I've only just received this sight and began to install it. The rear sight fits perfectly and the front sight is very slightly too tight -- as the directions state it might be, in order to fit all front dovetails. A moment with a file will make it ready (it already fits in about 1/4 of the way across, but should slip in a bit further with minimal force). These sights are OBVIOUSLY made with great care -- and they come with TWO appropriate punches and very clear and succinct instructions. One look at these materials and it becomes overwhelmingly obvious that they are made by someone who REALLY has a goal of making top quality products and providing top quality customer service. My first purchase of a Dawson sight; from now on I will always look first to Dawson precision for any product they provide.