<P> In 1998 , 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 . Later third - generation models additionally featured a modified extractor that serves as a loaded chamber indicator , and the locking block was enlarged , along with the addition of an extra cross pin to aid the distribution of bolt thrust forces exerted by the locking block . This cross pin is known as the locking block pin and is located above the trigger pin . </P>
<P> In 1998 , 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 . Later third - generation models additionally featured a modified extractor that serves as a loaded chamber indicator , and the locking block was enlarged , along with the addition of an extra cross pin to aid the distribution of bolt thrust forces exerted by the locking block . This cross pin is known as the locking block pin and is located above the trigger pin . </P>
when did the glock gen 3 come out
when did the glock gen 3 come out
1998
1998