Originally Posted By: billt460
Originally Posted By: Doog
I store mine is a safe. Do I need a dust cover in there? But I only keep 4 loaded.
That has been argued both ways. I'm a, "P-Mag fanboy". With that said, I don't store ANY plastic / Polymer magazines loaded. For that I use Aluminum or Stainless Steel G.I. magazines. UV light and heat are plastic's worst enemy. Also, constant pressure can and will deform them over time. Granted it's pitch black in a gun safe, and it sure won't reach a temperature to harm them. I just don't trust leaving the feed lips under tension for long periods of time without running the risk of deformation. And Mag Pul must not either, or else they wouldn't have made the dust covers in the first place. Yes, they sell them as "dust covers". But everyone including them knows they were put on the market to specifically relieve tension on the feed lips. If you rotated them every week, I doubt you would ever have an issue. But that's a big PITA. So I just use metal magazines stored loaded for whatever calamity exists on the horizon.
Magpul likely initially included the covers because they were a new product at one point, and hey, who has a crystal ball? However, over time, they have not noted any issues storing mags fully loaded, and with the new polymers and process they are using, it is even less of a chance of being an issue. Now, the covers are not included with their mags, in the MOE line, even. As to feed lip creep, I would be more worried about aluminum mags than the PMAG's. Neither has been shown to have an issue, though.
That said, the TAN PMAG's did develop a reputation for being a bit weaker. Currently, the "SAND" PMAG's are the strongest formula, followed by "BLACK". The new M3's have revised guides that prevent round transposition that I have experienced with Lancers, and previous PMAG's, as well, better controlling the round stack.