Originally Posted by JimIsland
Agreed.....If I was ever in a bad situation that would warrant a 33 rounder, I wouldn't use it becasue I don't 100% trust them. I 100% trust all of 17 round mags though. The only usefullness I can see for one is a for on-the-go storage.
Turned my factory 33 into a 31 rounder with a factory base plate. The with 33 rounds in it the spring tension on the last two rounds was always weak, it seemed like if I were to drop the mag they would have fallen out. Also any malfunction I ever had was with that magazine and the last two rounds.
Spring tension is a little better at 31 rounds but I still don't trust it for anything but plinking.