If you want something a little different and a little more rugged than a p-mag, go for the lancer L5 AWM and don't look back.
Steel feed lips molded into a much harder polymer body. They're also stanag spec so they'll work in pretty much anything. The AWM ones cured the problems previous lancer mags had with deet, so now they're totally chemical resistant.
Good luck breaking one. You can get package deals through some sites.
When I grabbed 5 of them to try out, I got them from rainer for $12 each.
For 20s I'd probably still go with pmags just because they're so small, I keep a few around for shooting off a bench more easily. I'm almost as picky about magazines as I am optics, and that's the best I've found yet for a polymer mag. Guess it isn't technically all polymer though.
A forum community dedicated to Springfield Armory XD and XD-M series firearm owners and enthusiasts. Come join the discussion about optics, gunsmithing, styles, reviews, accessories, classifieds, and more!