Bob, I'd say from personal experience (two 49s and a 649) the single-action on the Bodyguard is not something to rely on for anything more than an occasional couple of rounds. Reason is that the sides of the frame keep you from really getting a "grip" (for lack of a better term) like you do with a fully-exposed hammer spur. I have arthritis in my thumbs, with replacement joints at the first joint, and I can barely pull it back.