Due to the fact your 22 quick magazine has no markings It's not necessarily from Winchester. I have not seen a 22 shorter magazine that was not the exact same outdoors dimension as 22lr mag. I can’t visualize how a mag, like you explained, could chance be protected when inserted. https://highimpactrounds.com/product/winchester-defender-segmented-slug-12-ga-2-75-in-1-oz-1600-fps-10-rd-box/