All modern Smith & Wesson revolvers have internal safety features that prevent the gun from firing unless you deliberlately pull the trigger. For example...there is a small piece called the hammer block installed inside the frame that does just what it's name implies...blocks the hammer/firing pin from making contact with the cartridge unless you have the trigger pulled fully to the rear. Also, there is a part called the rebound slide that contributes to the weight of the trigger pull and trigger return strength. It also ensures that if the gun were dropped with the hammer cocked, and the hammer fell forward, the trigger will return forward before the hammer has a chance to fall completely...the rebound slide will then block the hammer from moving forward enough to fire the cartridge. Many will advise cutting a couple of coils off the trigger return spring to lighten the trigger pull, but in doing that you also reduce the speed at which the rebound slide moves back forward and therefore you jeapordize proper functioning of that part, IMO. So although there are no external safety devices on your 29, there are built in features that are meant to prevent unintentional firing. Of course, no mechanical device can prevent an AD if safe gunhandliing practices are not followed. Hope this helps.
