Needs a little modification - Strike Industries Enhanced Magazine Plate for PMAG Gen 3

Unmodified, it is almost impossible to install. The latch is too big and too inflexible to slip over the base of the pmag. If you instead use a knife to shave down the catch, it will install much easier and the roll pins will lock it in place. removing the roll pins is a bit tricky, but can be done with a punch or by putting the pins against a metal ledge and pushing down on the baseplate.

I found that in a 30rd gen 3, I was only able to get +3.

Despite the problems, it does allow for +3 rounds and makes it easier to pull from a mag pouch.