I used a Doc Hadaway lock on the first scratch rifle I made. It was the best thing available at the time and a good performing lock. Unfortunately, the rifle was pretty awful. Once I started making half way decent guns, I cut up the stock and recycled the parts, at least the barrel. I still had the lock when Doc Hadaway's granddaughter contacted me when I was running ALR to inquire as to how she might get one. Apparently, the family hadn't kept anything of his work and the granddaughter wanted a memento of her grandfather. I sent her the lock as a gift.