Because your 22 quick magazine has no markings It's not from Winchester. I have never noticed a 22 short magazine that was not the same outside the house dimension as 22lr mag. I am able to’t think about how a mag, like you explained, could probability be secure when inserted. https://highimpactrounds.com/product/winchester-super-x-270-win-150-gr-power-point-2850-fps-20-rd-box/