6.5 Grendel magazines

I started out attempting to use E-Lander magazines for my 6.5 grendel builds, but quickly switched to duramag as explained in this video. I have used the amend2 polymer grendel mags, but was less than impressed.

I'm not sure why people think you can't have double stack polymer mags for 6.5 grendel since when you try to load lancers with it the only issue winds up being overall length and lack of taper, not width.
Of course it won't stack as tightly as anything in the .378 rim diameter class so you can't get 30 rounds in the same magazine height, but the D&H 7.62x39 mag I show is a 30 rounder and it naturally has the same .44 rim as grendel, arc, and 5.45x39 which is why I wish D&H made a grendel compatible mag as the duramag only fits 26 rounds.