"The Winchesters ( and Mossbergs) are aluminum receivers."
Not an issue. The receiver does not take the recoil. And Remington is sure proud of this:
"The anodized-aluminum receiver, nickel-plated barrel and internal components offer extreme corrosion resistance keeping the Versa Max functioning flawlessly and looking good through wet, sloppy hunting conditions."
The greatest Remington shotgun ever