I can tell you a secret: IF Mark comes to making something like this it will be an 1X 21700 body with 1X 21700 extender(s). So you can have it the way you want: 1 cell, 2 cell or 3 cell setups!
I already have FM 3x16650 battery holder which fits nice in stock M6. Also 2x18650 by altermann so i'm happy with 8.4V and 12.6V options.
What i found interesting is 2x21700 M4 style body.
But even better would be to design incan softstart like AW's back in the days.
Softarters implemented in tailcaps C and M6 would be absolutly [emoji2962]
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