Yup, I really don't know of any other viable options.C Products/ASC banana mag, with a Wolff AK spring in it.
No, I'm selling AK on BG and got 7.62x39 upper for my AR.Y not just get an ak?
While your observation about the round taper is accurate, it's not entirely accurate to assert that it's a show stopper issue in the AR mag well. I've got easily 10k rounds through various 7.62x39 chambered ARs, and I can count on one hand (using no thumb and only one finger) the number of feed issues that I've had using the last/latest generation of C-Products/ASC mags. They work 100% for me using brass cases ammo as shipped, and require the Wolff AK mag spring to work 100% for me using steel cases ammo.picture this.. line up a bunch of 7.62x39mm cartridges side by side.. note the curvature theyll create due to the taper of the cases.. then draw two straight vertical lines to represent the straight magwell of an AR15.. now try figuring out how youre going to get those cartridges into a straight taper smoothly that isnt going to cause feeding issues.. then ask yourself, do you really want to give up an AK for an AR15 upper?