If you shoot a nickel plated SG at clay pigeons and hit all of them,Drivie, you'll be taken very seriously.
Some ranges have iddywa rules about bbl length. All allow only one or two shells to be loaded. Check first.
As for mag extensions, it's up to you. Few HD confrontations that can be solved with a shotgun will require more than a shot or two. OTOH, the extension aids recoil control and can tighten up slug groups.
As for Parkerizing vs the Express finish, my overpublicized parts 870, yclept Frankenstein, has an Express bbl mounted to its Park'd receiver. Plenty of wet usage, including salt marshes and goose blinds. No rust on either.....
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