I love that mod. It hits noticeably harder than pretty much every other mech I've used. I've side by side tested it to a brass limitless, copper limitless, rig v2, AV brass Able & a few others. I have a few sets of VTC4's & used them in each mod to keep things fair, but this sub zero is something else man, even with a top contact. Well, the positive contact is actually at the bottom of the mod, manual says to put the battery in + facing down.
Sounds good, thank you for the feedback.
It's definitely a beautiful mod