Im curious as to how it happens, why it happens, what exactly causes it, where it is most noticable? Any information would be helpful. Thanks,

Scott

For me it's usually Mexican food....... ....DJ



Sorry I couldn't resist....

As the hot, high-pressure, high-velocity gases from the burning powder charge shoot through the gas port of a self-loading, gas-operated rifle or machine gun, they melt a little of the barrel steel out of the hole and carry it away, (just as the same gases melt and carry away metal from the bore of the weapon). This eventually leads to a significant enlargement of the gas port hole, and a change in the way the action of the weapon operates.

And I would opine that if you are shooting an AR-15 rifle or something similar, it will take many thousands of rounds before you notice anything different from Round One. When the hole enlarges, you will only have more gas being directed toward the bolt carrier, which will further improve the functionality of the action. I have a rifle that wouldn't cycle; it had to be sent off to have the gasport enlarged-- works great now.