Dec 24, 2020 · Second, The Zev V2 compensator was designed for the Glock 19, and when combined with ZEV threaded barrels, a G19 with a PRO V2 has the same slide length as a Glock 34 – meaning you can use a G34-compatible holster. Another nice feature is the set screws.
"Gen4" is rollmarked on the slide next to the model number to identify the fourth-generation pistols. The Glock 17 is the original 9x19mm Parabellum model, with a standard magazine capacity of 17 rounds, introduced in 1982. Several modified versions of the Glock 17 have been introduced.