I have a 12.5" mag fed and would love to hear suggestions as to how to get it to feed correctly. I've named it Bob Marley, because it's always jammin'. Shells stand up vertical in the mag, others start to get fed then jam up. It's a lovely shotgun and I've dressed it up with a recoil reducing stock, etc. But it just doesn't feed well at all. And I've purchased 4 additional magazines, making that 5 in total. They all do the same thing. There's a Youtube member who suggests cutting down the spring and polishing the edge of the mag, which I've tried. Exactly the same issue continues. I would love to hear some advice, I'll send you a gift card to the liquor agency of your choice, lol.