Chrome lining helps prevent/forestall plastic fouling. Several days of high volume dove shooting will verify this. Hot barrels will build up plastic fouling much more. When the chambers build up with plastic to the point that the empties will not eject, but the bores are clear, it's pretty obvious the advantage of the chrome lining. I've seen this many times on my 20 ga. Beretta 687 SPII Sporting, in Argentina.
For most applications it may not hold any advantage. But, for high volume, it is as obvious as a neon sign on a dark highway.
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