It was a DEA frisbee test, not FBI. It was an aggressive drop test which involved throwing G17s ~15 feet with a 4 foot drop. This simulates accidentally falling/tripping while carrying a pistol while at a full run.
In the test, the frame separated from the slide the first time with every pistol tested. This resulted in every pistol becoming inoperable due to rail failure and the testing for Glocks stopped immediately because no pistols could be made to fire.
Rather than admit serious design flaw & recall all Glocks, Glock decided to quietly redesign the rails and offer free
for all Gen1 pistol slides. It took 2 tries until the rails design was made satisfactory, that is part of the reason why there are 3 Generations of Glock pistol designs.
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