65 Receiver Set with Polymer mags from PF (HOPEFULLY)

[stanc]

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.

That would likely still prevent proper alignment of the cartridges with the feed ramps.

The companies that make polymer magazines have intelligent, creative design staff. If a Grendel polymer magazine that fits the standard AR15 mag well was feasible, it would've been made by now.

The unavoidable fact is that such a polymer mag is simply not doable, and none of the proposed mickey mouse "solutions" are viable.

Want a Grendel Pmag? MagPul and LWRC have shown what is necessary.