Grendel mags?

[stanc]

'Zackly right, Stan. All the folks speculating need to spend $14.50, get a pmag, and load it with Grendel. And watch it flex & bulge. :-) Stick int the mag well. Periodically spew cartridges & create jams. Then drop it and watch what happens. (speed ejection of the cartridges)

Now much of that is due to the narrow stack due to the thicker walls creating side pressure on the mag walls. But those walls are thick in poly mags for a reason! Without that you lose significant rigidity and strength.

If what LRRP has in mind by his "hint hint" is what I described -- a polymer mag with thick walls for that portion which extends below the mag well, and thin walls for the upper part that's contained by the well -- it seems to me that idea could be tested via the method used by sneaky one:

Get one of the straight-body, 20-rd P-Mags, file the interior of the side walls to the needed thickness, and reinforce the exterior of the side walls below the mag well line.

For $14, plus a couple sheets of plastic or aluminum, a bit of glue or duct tape, and some time using a couple of files, one could determine if that concept would actually work.