I think if you put an Express barrel on a Wingmaster you may go to hell for it.
Mine's a 1970, I think it's 2 3/4" only. Never needed a 3" shell, though.You'd have to have really old Wingmaster for it not to chamber 3" shells.
That's good to know, but it won't put a detent ball in the Express barrel nor install a ratchet in the Wingmaster magazine.The Remington factory part for adding sling swivels to your gun--the cap comes set up for both the old ball detent and new rachet spring retainer systems.
Why does he need to buy another barrel if the one he has will work?