Your gas port does not erode in diameter. If you start with a 0.062" gas port after a few thousand round you still will not be slipping a 0.065" diameter gage pin in the hole.
https://www.thefirearmblog.com/blog/...44-495x660.jpg
This quote sums it up quite well:
"People have the mistaken idea that gas port erosion is the gas port actually getting bigger.
"It ain't so.
"The erosion mechanism is a widening of the gas port on the downstream side, making the gas port a more efficient nozzle, thereby allowing increasing the maximum mass flow through the port. This makes the post-port pressure higher. If you look at a typical eroded port, gauging the hole would not reveal a significant enlargement of the port."