Well Mp5K magazine issue

[shaharov]

I'm having a problem with some new mags for my Well Mp5k. I puchased some Well 50rd mags (actually only hold around 38, but that's a different story). The gun does not seem to fire with it unless I pull down on the Mag. I'm guessing that the mag is sitting too high (or the seal is sitting to high) on the new mags. Just wondering if anyone else has had this problem and may know a solutions for it.

Thanks