I think what he's saying is that the end caps ensure that the feeding end of the mag doesn't become deformed over time under load, which would compromise its interface with the receiver & ability to feed rounds properly. That's just my guess, knowing nothing about this ... but now I'm off to the inter webs as my curiosity is piqued and I got a box with dozens of empty PMAGS and Hexmags I've never loaded/used ...
Why not leave the magazines loaded?
I think what he's saying is that the end caps ensure that the feeding end of the mag doesn't become deformed over time under load, which would compromise its interface with the receiver & ability to feed rounds properly. That's just my guess, knowing nothing about this ... but now I'm off to the inter webs as my curiosity is piqued and I got a box with dozens of empty PMAGS and Hexmags I've never loaded/used ...
Exactly.