I got a Klone by AsMODus in copper its got a magnetic button and hybrid top so the rda or what ever you put on it makes direct contact with the battery just dont put anything smaller than the tube and you will be fine. I wanted to see if i could use the nautilus mini on it and the it wouldnt fire real and the battery got extremely hot but other than that my mutation x and atlantis fit perfectly on it and works like a charm. The only other issue is the gap when my competition doge is on my mod. I think it was like 70 at my friends shop not including my 10% discount.