Accuracy will almost certainly begin to degrade after a point, but depending on the accuracy requirements of the person using the gun, the pistol may still be shooting with acceptable accuracy after 100K rounds.
There are a lot of variables that control how soon the accuracy degradation begins and how rapidly it progresses. It's pretty difficult to make accurate predictions.
Of course, barrels are replaceable at relatively moderate cost. There's even a reasonable chance that Glock would refurbish the gun at no cost, possibly even including barrel replacement, if you sent the gun to them for service.
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