cmacclel's tank are smaller than the normal full M-tank so be aware of that, you may have to use the original drip tip from the Kayfun on it if the tip you try to use has a tiny diameter. This is caused from the chimney portion having to fit in to the mouth piece due to the added height from reducing the tank size. I have one and really love the thing, it fits more flush to the mod vs the official Svoemesto tanks and it's got a more clear appearance.