Which Silhouette rear sight? Bo-Mar makes one, with the usual crisp Bo-Mar quality. The one which is furnished by FA is made by Jim Rock of RPM and is marked Iron Sight Gunworks. It looks good, and offers a good sight picture and fine adjustment, although clicks can sometimes be a bit mushy. Because of the extra height, they require a front sight about .100" taller than the standard height rear sight would require.