Grendel mags?

[pinzgauer]

Before everyone get's too excited over pmags, there is still the core issue of the mag body bulging badly when loaded over 10 rounds. This is not a feed lip thing, it's the thickness of the walls not allowing the grendel cases to stack in the same fashion as 5.56 does. In a true double stack, the pressure of the spring is mostly transmitted upwards by the round directly above, but on the same side. IE: Any given case touches the case on the opposite side of the stack as well as the one directly above and below in the stack.

So there is not much spring pressure trying to spread the rounds into the walls in a normal double stack like the current cprod grendel mags. (and pmag with 5.56)

The pmag walls are thicker, so the "stack" is narrower. So the Grendel cases only touch each other cases at an angle, which forces the walls to try to expand under the spring pressure.

This is the problem with pmags & grendel. No amount of lip or follower grinding will address this. I suspect any plastic mag will run into this issue. I'll try to post some photo's which show this, it's easy to see.

So yes, pmags work to a limited extent as is. But will never be as reliable or have the capacity of steel mags with the current body design.

If you are willing to pay $40 per mag, the barrett & PRI 6.8 mags may be worth a look. They are pretty mags, but I'll never pay that given my dozen or so cprod grendel mags all work flawlessly.

But trying to modify pmags is the long way around unless you are happy with 5 round mags. And still will not be as reliable as the currently available cprod. (Don't know about the ASC mags. D&H had a good rep, but the 6.8 mags photo's I've seen so far look worse than I ever saw from cprod).