In August 2017, Glock presented the "fifth generation" or "Gen5". The revisions centered on ergonomics and improving reliability. Many parts of fifth-generation Glock pistols cannot be interchanged with those of the previous generations. The two fifth-generation models announced were the Glock 17 and Glock 19, chambered for the 9×19 mm Parabellum. Some conspicuous changes on the fifth-generation models are: ambidextrous slide stop levers, nDLC (Diamond-Like Carbon) surface finish for barrel and slide, a barrel featuring a revised style of polygonal rifling (called the “Glock Marksman Barrel” by Glock), a deeper recessed barrel crown, omission of the finger grooves on the grip, a flared magazine well, and a reintroduction of a (half moon shaped) cutout on the bottom front of the grip. The locking block pin located above the trigger pin that was introduced in the third-generation is omitted. Many internal parts were less conspicuously revised. "Gen 5" is rollmarked on the slide next to the model number to identify the fifth-generation pistols. The magazines were also revised for the fifth-generation models. The redesigned magazine floor plates feature a frontward protruding lip to offer grip for manual assisted extraction and the magazine follower became orange colored for easier visual identification.
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