Thanks to Ratus, I have a "how they did 5.56" version of Stellite lining.
It's mentioned as being similar to 7.62.
Make a normal 24" chromoly-vanadium steel barrel, rifled a bit overbore to allow for chrome lining.
Hog out the chamber end 6" deep.
Heat that bitch up.
Shove in your 6" long chambered and pre-rifled (also overbore) stellite liner; which is still an interference fit with the heated barrel.
Let cool.
Chrome plate the bore 0.005" to 0.0015" thick.
Ship!
There's a fixture to make sure the rifling in the liner aligns with the rifling in the rest of the barrel blank.
The 5.56 experiment didn't do well. Accuracy fell to the rejection standard after just 990 rounds fired.
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