Engineering & Technical Division

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TaylorWSO @ ar15.com dropped a loaded Magpul polymer PMAGS onto concrete in -30 degrees, feed lip first:



So to the drop test. I wanted to see what they could do in the cold. I dropped it from the same table (3′ high) I have dropped metal mags from on the range. If you drop a metal mag on concrete from the same height it will damage the feed lips as to be unuseable-but you can bend them back. I was planning on dropping them on all sides but it broke before I could try it. From the table, fully loaded, no cover, both feed lips shattered when they hit the concrete. I expected it to break/crack but these things shot off and rounds went everywhere. I stopped the test right there as didn’t want to try it with any others on the other sides. You can see in the AK HTF that if empty they do fine in the cold.



So what does this mean.

IF you drop ANY mag loaded on the feed lips it will be useless. The Pmags might survive during the summer but all metal mags will bent hot/or cold. The metal mags can be bent back.
The plastic shatters when cold (duh) it doesn’t just crack.
The result: cracked/split feed lips:



Some plastics becomes become brittle in cold conditions, so this is not surprising. The good news is that Magpul are not sitting on their laurels. Their latest version of the PMAG can survive a drop from 5 feet onto concrete feed lip first, fully loaded in -30 F. See this video shot with a high speed camera:




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