I’ve seen chrome lined barrels have the chrome stripped out of them like a potato peel by inexperienced gun modifiers.
Seldom does anybody attempt to polish the surface finish in the choke area that was modified to match the mirror like finish the chrome provided prior to removal.
Time is money, so if you want a nearly invisible choke reaming, you have to pay for it.
Dr Wonko is inaccurate on this matter.
FWIW, chrome is hard, it takes a piloted reamer w/ carbide cutters to cut it precisely. Is it always best to make sure the gun modifier has the right tools before you hand over your barrels. Or disappointment will follow.