The Six8 uses a poly Magpul 6.8 mag with interior OAL of 2.32". Now someones going to come along and build a steel or aluminum mag getting the most out of the new mag-well dimensions. Those dimensions have yet to be made public but for all we know .473 diameter brass might double-stack in such a mag, and the interior length without the poly could easily be in the 2.4" neighborhood.
I thought that magwell and those mags looked bigger, I was in the sandbox and didn't have a dial caliper to measure them though.
