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About 5 years ago, I had my late 80's vintage gen1 G17s inspected by a technician at the Smyrna plant. He came out and told me that the polymer had crystalized and the frames may fail. He demonstrated by attempting to twist the grip area while holding the trigger guard, and I was able to hear crackling.
He said not to worry, went back into the plant, reappeared 30 minutes later with both pistols reassembled with brand new frames. No Charge. 50k rounds through both, no other service beyond regular cleaning and maintenance ever performed.