Never.
Spend the $18 every 10,000 rounds on a new gas tube and your good to go
Unless something odd happened... I'd probably never clean it.
I however might replace it if i noticed surface rust...
A friend of mine has issues with his guns getting rust spots even after a day at his beach house... Of course that's an uncommon situation. Mehhits stainless not much chance of that.
as posted above, clean the carbon of the outside where it gors into the gas key, look for damage but other then that change evey 10k
bbb
its stainless not much chance of that.



























