Oh and if you got Meps, the two pair I got both had instructions that said if the rear was tight, file on the slide. Considering the price of a slide compared to the price of a new rear sight that hit me as a very stupid idea. Test fit it before you put the spring and pin back in. Try from both sides, it will go in easy from one side. If it won't go all the way in once again get something that will not mar it or just push it with a piece of wood. Do it somewhat hard but don't force it real hard, tap it back out, look on the bottom of the rear sight and the dovetail sides for scuffed areas. Hit these just a few times with a fine tooth file, try again and see if you have to repeat it. It should take almost no filing, it did not even leave a silver spot on mine.
Rockets Out..