I hate mandated trigger locks, but voluntary ones can be a good idea, and my brother just had a baby, so he wants me to help him research before the kid becomes a toddler which trigger lock is the best out there for the one gun he plans to leave outside the safe in his bedroom, a S&W model 66-4 .357 Mag. Seems to me a code-controlled one would be more desirable than a key-controlled one, for quick access when you need the gun, or maybe one of those little boxes with the code-keypad. Any suggestions along these lines?