Yup. The square rear end slides into the slot on the top of the frame just forward of the hammer. Press down on the forward part of the sight with your thumb while screwing in the tiny screw into the top of the frame with a proper size screwdriver.Bought one on eBay, seller listed hole to hole measurements and matched my 57 sooo should be correct, supposedly sight came off a 29-2 6” blade hight should be correct? Any tips on attaching? Thanks