Dad and i went shooting again this weekend. I was shooting the Blackhawk and the front site blade took off on the third shot. This is the second time this has happened since Dad bought it a few years ago. Both times this has happened we were unable to find the blade to see what it looks like. A new site was installed by a gunsmith the first time. The site blade fits into a deep groove and is pinned in place. The pin is still there and is fully in place, so the blade itself has to be breaking in order for it to take off like that. Anyone else had this problem or hear of it happening.