65 Receiver Set with Polymer mags from PF (HOPEFULLY)

[cory]

I was thinking about the single stack mag some more. My suggestion for it came from a concern that if the magazine was the nominal width for stacking the Grendel case, the bolt lugs may be to short to catch and chamber a round from the magazine.

I think converging the top of the magazine may still be a solution, just not to a single stack. We could converge it to roughly the width of a standard M4 mag.