This is a brand new gun using factory ammo (Magtech 45a).
Easy enough to check if there's a proper extractor fit,take the slide off and
insert a round in it,then inspect it with a loupe,only the case rim should be in contact.It is possible that he has two defective magazines,I seem to have got at
least one that was junk out the box,it was binding so bad that it had some
serious wear marks on the follower skirt,they told me that it was normal even
though it was causing failures to the sixth and seventh rounds.
At the very least OP could try a GI style magazine.