That's what I was thinking to. Buy one kit for my 12, and two for my 15 round backupsMagguts has had some ‘minor’ teething issues with some of their mag kits. There’s a longer thread on one of the other boards. It specifically mentions polishing, smoothing, ‘dehorning’ some of the edges of the spring or followers. I’d hate to spend that money for something not to work, but I’d hate even worse to just throw it out.
I think maybe give it a few weeks to months after release to see if/how it’s working out.
At that price, I don’t think they’re meant to go into all 16 of your mags that fit that gun, but maybe in the primary mag or first backup mag, is my thoughts anyways.