![]() The serial number on the frame was etched on a metal plate molded in the polymer frame (a few of the first Second Generation pistols do not have the metal serial number plate).Īfter a while, a third cross pin appeared in the handgun, to better support and distribute the energy transmitted to the polymer frame by the locking block, originating the “three pin system”, since then unmodified and still in use today. The magazines now featured a metallic “skeleton” over which the polymer was molded, significantly improving feeding the barrel wall thickness was increased, the main recoil spring and guiding rod were assembled together in a “captive” configuration and the rear slide guide length was increased. In 1988, the “Second Generation” Glock was introduced: the grip had slightly raised side panels with the same texture as the previous generation, but the, still straight front and back straps sported a deeply engraved squared checkering. Note the thumb shelf, and additional pin on the locking piece introduced in the Gen 3 pistol, and the different texture on the pistol grip plus improved and enlaregd mag release button on the Gen 4 Three Glock 17 generations compared: from left, Gen 2, Gen 3 and Gen 4. ![]()
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