The factory rearsight on my late-production Mk.III Browning HiPower broke and I decided to replace it with a white outline rearsight and a white dot foresight. The new sights were a perfect (very tight) fit to the existing cutouts in the slide. The white rearsight outline and white foresight dot are a great improvement, particularly for my older eyes. Overall I am very pleased with the replacement sights and the end result. Recommended.