For my 1st revolver, I want to get a double-action (with exposed hammer) with 3 to 4 inch barrel stainless steel frame in 357 Magnum. This will be for home protection and range shooting and will not be a CCW. I’d like to get a high quality, reliable and durable with smooth double-action trigger and excellent sights (night sight?). I read S&W’s trigger tends to be a bit smoother than that of Ruger. But I’m so confused with the various models S&W offers – 686, 686 Plus, 686 SSR, Model 60 (pro series), 627, etc. 6 rounds cylinder would be perfect. There’re model that offers 7 to 8 rounds but would the cylinder wall be “too thin” to stand extended 357 Mag. Ammo usages? Would you recommend a few S&W models and share your experience with these models? Lastly, what about the S&W inter-lock feature? Some models have some models don’t have that feature. What’s the use of the feature? Would it render the gun less reliable (more moving parts) in a defensive situation? Thanks much for your info.