The listing of the changes, and what each change entailed, is available in detail in the Standard Catalog of S&W. The SCSW should be easily located or ordered for you at your local Barnes & Noble booksellers.

The 19-5 was the first variant of the model 19 to do away with the pinned barrel and recessed cylinder.

The 19-5 was also the first 19 to incorporate the crush fit barrel. IMO the early crush fit 19 barrels are responsible for the widespread internet allegations of "Weak K-frame magnums". It took S&W some time to get the process right. Still today, early production 19's can be found with the donut in the barrel from being over torqued.

The 19-8 was the last variant of the model 19. It included the frame mounted firing pin, and MIM parts, as well as the integral frame bolster.

The 19-5 was followed by the 19-6 and 19-7. Both the 19-6 and the 19-7 retained the hammer mounted firing pins.

The 19-6 and early 19-7's both had forged parts vice MIM, although some 19-7's incorporated MIM parts as production of the 19-7 progressed. I prefer the 19-6, but do own a 19-7. The only complaint I have with the 19-7 is that it rings like a bell in dry firing. Cheapening of construction to cut costs.....IMO of course.

Some of the nicest 19-8's were the 3" barrel 19-8's produced for Walther. Marketed as R99 LaChasse by Walther, they are seldom seen in this country. They bring a big price tag when they are found. Hope this helps. Regards 18DAI.