Yep - About as rare as snake feathers.
AFAIK, you will have to obtain a blued Model 1200 barrel in the longer length & have it nickel-plated/chromed, since IIRC Winchester never made a longer stainless/etc M1200 bbl.
Google "shotgun barrels" for places like BarrelExchange.com, Corsons.com, & others, for sources.
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