Just a general heads-up on an interesting part for sale on a classified forum. The item number on
www.24hourcampfire.com is 10736980; it is advertised as a 219/220 bbl. missing the front sight bead but otherwise in good shape. Price is steep ($275), and you'd really want to have a 28 to pay that, IMO. But perhaps he'll come down. I don't recall if he mentioned bbl. length, and he didn't mention what model of 220 or manufacturing site.
Have a look if you're interested. Seller's handle is "vixen" and I know nothing about him/her. (I just sold my last 28 guage barrel, for a T-C Contender Carbine, for this same price, so maybe it isn't so far out of line....).
Mike Armstrong