[dodgetheram]

Dose it feed the rest of the mag if u hold it up into the magwell? That would tell you if the seating was off and causing misfeed.

I bought some old micaps and one started having similar problems, turned out the spring was broken all together. Sounds like u may have the same problem.

Take some time and open it up for an inspection, its not all that hard. You'll need some percision screwdriver and probly allen keys.