I've got a box mod that works great with a 1.25ohm DC carto. It's especially good with 2 x IMR 14500s but works 98% as well with regular protected 14500s. It a 3xAA box (translucent red) but it's not a regulated mod. The two batteries are wired up in parallel so you get double the mAh and available power (current) but still at 3.7v. I built it to have a small box mod that would run a long time and it wasn't till sometime later I realized it worked really well on real low resistance atties / cartos. There is a commercially available mod like this but I've owned one and was NOT impressed with the build quality. That's why I built this one. It's the red box on the far left of this
pic. If I had it to do over again I'd probably use a regular horn button switch instead of the one on it (sticks out just a tad too far).
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PS: Just tried the 1.25 ohm DC carto on my 'Great Bites' tin 5v box mod. It fires, but dang... do u really want to? No!
PPS: I've also got a VV project on the bench that also will fire them because it has a 6A regulator in it.... maybe someday I'll get time to finish it. So it can be done. It just takes a little heavier stuff to make it work right. ;-)