Issue w/ 20-round PMAG

[Usagi]

I recently bought 2 20-rd. PMAG's.

One of them has had some issues. It will not feed the 2nd to last round.
I have to play with the charging handle and shake the rifle a bit to get the bolt to "catch" the round.
The mag does this with every brand of ammo I put in (6 different brands tested).
This is never an issue with any other mag I own - PMAG, or USGI.


Is there a quick & easy fix?
Not afraid to send it back, just wondering about a quick fix, if possible.




Also, have a USGI 20-rd. mag that locks the bolt back on the AR15 about half the time with one round left in the mag. Quick fix on that one? (not as important, I can always just hit the bolt release to solve this "issue")

 

[docnyt]

Does the malfunctioning Pmag look any different from the others? Any malformation of the feed lip and follower? If you replace the spring and follower with one of the functioning Pmags, will it work?

 

[Usagi]

Does the malfunctioning Pmag look any different from the others? Any malformation of the feed lip and follower?

Looks the same to me.
(<-- Not really a mag building guy... yet)

If you replace the spring and follower with one of the functioning Pmags, will it work?

Probably. I'll try that tonite & report back...


ETA:
If it is the follower (my guess), are PMAG followers the same among 20-rd and 30-rd mags? I would imagine the springs are different.