My buckmark factory rear sights were alittle hard to see, so I found some william sights and decided to give them a try. Took a good minute or two to get the spring in there, LOL! Made a worlds of difference. At first I kept the factory front sights on there, big mistake. Couldn't get it sighted in properly. Had the elevation all the way down. Put the williams front sight on and was dead on. Pretty happy with the sights now, awhole lot easier to see now.