☆870 12gauge super mag receiver☆2ND UP DATE!!

I MIGHT STRIP IT AND SELL ALL THE PARTS  INDIVIDUALLY IF THERES ENOUGH INTEREST. LET ME KNOW MEMBERS. DATE!!!!SO I TOOK THE TRIGGER OUT OF MY OTHER SUPER MAG TO SEE IF IT FEEDS 3½ AND IT MADE NO DIFFERENCE. ITS SOMETHIN  SIMPLE EITHER THE ACTION BARS OR, IN TIMING MY GUNSMITH STILL HAS IT WILL LOOK AT IT WHEN HE HAS A CHANCE. HE'S VERY BUSY. HE HAS A THICK 870 MANUAL AND WE FOUND WHAT THE ISSUE IS IN ONE PARAGRAPH. I WILL DROP IT TO $200 IF SOMEONE WANTS IT AS IS.  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.  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 🍻