870 12gauge receiver super mag

UP DATE!!!!SO I TOOK THE TRIGGER OUT OF MY OTHER SUPER MAG TO SEE IF IT FEEDS 3½ AND IT MADE NO DIFFERENCE. SO ITS NOTHING TO DO WITH TRIGGER.  IT MIGHT BE IN THE PUMP. The bars or arms maybe.  Hey members,  I, have a 870 super mag receiver , 12gauge that shoots everything that Remington makes for shells. BUT there's a catch the spring is weak for the lifter to feed 3½ shells. I did have it feed once.  It loads and feeds 2¾ and 3" all day long. My gunsmith tried to order a Wolfe spring kit but they are out of stock.  Maybe you guys might have a source. She has some wear and bluing loss. It is used and selling as is.Will ship or meet local. Any questions call or text Mark 1(506)261-1922 thanks for looking cheers 🍻