What are the pros & cons of a 4" model 19 versus a 4" model 65? What are the major differences? Forgive my ignorance. I couldn't find a specific thread comparing these two. Do the model 65s have the same cracking issue with 125 gr. .357 mag loads that model 19s are rumored to have after heavy use? I notice the 65 doesn't have a full underlug, either. I'm not knocking the 19, nor would I expect that if I owned one that I'd shoot enough ammo through it to crack it. I'm just trying to find out the differences and why S&W made the 65 after the 19 (I'm assuming it's more recent given the higher model number).