Mags not reliably feeding on an Ishapore 2A1

[Dieudonne' Saive.]

remove the magazine, re-insert, seat the magazine with a good hard slap, and try again.

Sometimes the magazine don't fully seat (even though it clicks in and you cannot make it move deeper).

Of course. But ALL FOUR mags are encountering the same issue. I even applied upward pressure on the mags after being seated to simulate this BTW.