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12/24/2008 6:52:15 PM EDT
Out of 10 lowers that I tested, the P-mag would not drop free from 4 of them.

Mega        yes
Stag        yes
Stag        yes
Sabre Defense (poly)yes
Sig 556yes
LWRCyes
LWRCno
LMT        no
ZM        no
Double Starno
Aluminum USGI mags work fine in all lowers.

I found a post that suggested filing off the two shims on the rear ribs of the magazine.
See post here  http://www.ak47.net/lite/topic.html?b=2&f=124&t=164366

I figured I would risk one mag and give it a try. Low and behold, it worked!!!!!

Has anyone else tried this?
Does this effect reliability in lowers where it dropped fine without the modification?  
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