Well been shoppin around for the fun of it and noticed a supplier i like has 306 cartos, but no 510s. Now ive read that the 306 have the same threads as the 510 other than that though what differnce is there?
From what I gather not a whole lot of difference except the diameter of the 306 carto might be a hair smaller causing a 510 drip tip not to fit. 306 Blank Cartomizers
Just like everyone said, these are smaller around than 510s, they won't fit in the chibi tank, lil' mama tank or smoktech tanks. Speaking from personal experience here.
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