this2.5 no checkering in finger grooves.
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this2.5 no checkering in finger grooves.
2.5 no checkering in finger grooves.
Third generation models
In the late 1990s, the frame was further modified with an accessory rail (called the "Universal Glock rail") to allow the mounting of laser sights, tactical lights, and other accessories. Thumb rests on both sides of the frame and finger grooves on the front strap were added. Glock pistols with these upgrades are informally referred to as (early) "third generation" models.