Quote:
Originally Posted by gqllc007
Thats so they can use the same slide for the other calibers. The barrel of the 9mm is thicker to accommodate the larger slide opening for .40
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This ^^^
It's basically a filler. If you were trying to put a 9mm barrel into a 45acp slide the barrel would be even thicker. In the end only the lands and groves really matter
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