I don’t have a line on a 28 220 sorry. I do have a little info. All 220s are built on one frame. Barrels may or may not fit other frames but many do. Of course barrels must have matching forearms to gauge. Also 219 rifles are built on this frame as well and there were some combos sold. Barrels only differ slightly by the cocking lugs early-late. I am fortunate to have 2 28s, probably the best deals Ive ever found too. Also have a 410. They are choked tight as said. Neat little hammerless.