There's a whole world of 21700 tubes out there, at affordable prices. A SMPL with a bigger outline would still have the same problems, No threading,in order to keep the "low profile" switch, which results in horrendous voltage loss. A bit of clever thinking could make it possible, but then the question is, why?

Nostalgia doesn't make for the best modern companion.

With changes, yes. But just the same mod holding a bigger cell and 24mm atties? Nope.

There are other vendors with loads of 21700 tubes, modeled after popular mech brands...but they aren't sold here anymore.

I hope you get what you want, Troep. But only so I can listen to all the bitching when it releases for 19.99 with sub-par performance, lol.