After the ban sunsetted, I decided I was not going to be caught short of high capacity mags again and especially not for my Browning Hi-Powers which are the last guns I would ever give up.
About once a month for nearly a year CDNN would have specials on various magazines. I ended up getting maybe a dozen Mec-Gar 15 and 20 round mags for the HiPower and also about the same for Argentine military 15 round with a 2 round extension which you could add your self. Before the ban I bought a 30 round mag with no name on it but it appeared high quality which shooting it has confirmed. Also a mag dealer told me it was no ordinary USA or other el cheapo brand. He thought it might have come from Argentina.
They all work perfectly except for two problems. The Argentine mags have such a strong spring that cannot fully load them with out a tool and that might be why they included the tool with the order.
The other problem was two USA brand mags I bought before the ban. They were cheap and should have been cheaper. One jammed regularly and is now pounded into flat sheet metal. The other one works but I don’t have confidence in it.
I also have a few FN made 13 round factory original mags. None of them have the little spring protruding in front near the bottom of the mag to shoot the mag out fast rather than just dump free.
Leave the Argentine mags full up with ammo for about two weeks. The spring will take its final set (it’s actually overpressure for the application) and you will be able to load it by hand without the tool and without impact on reliability.