Right now I have the Quark AA2 Regular. If i were to buy the AA Tactical, would the heads and tail caps be interchangeable? It says they are both .9 - 4.2 volts. Sorry for the newb question.
yes the 0.9-4.2v head is compatible with the 1xAA, 2xAA, and 1xCR123 bodies. Only the 2xCR123 has a different head. And all the tail caps are interchangeable