the G19 has evolved through several generations, terminating most recently with the Gen5 introduced in 2017. This updated variant includes a Glock Marksman Barrel with more clearly defined ...

and the new 6" barrel 10 mm G40 hunting handgun. For 2016, Glock is expanding the MOS line-up to include two of its most popular 9 mm models, the Standard size Gen4 G17 and Compact G19.

It is a Gen 5 design, which means it incorporates all of the design enhancements of the Gen 4 models, including Glock Marksman Barrel ... G17 MOS, and G19 MOS to me at the same time.