I've heard that oil rigs designed to smoke concentrates hit better than simple nails that adapt onto 14/18mm bongs. Is that true? Is it worth spending the extra money to buy a whole oil rig?
No, the only difference between dabbing out of a straigjt tube piece and an oil rig is the size generally. You will get better flavor from a small piece. The previous poster is wrong about losing "smoke", thts up to the nail or nail and dome you have. Buy a new piece if you have extra $, if not but more herb and oil!