[armandozx]

Dude the caranx and the tuna are basically the same thing just the "package" comes in differently.

Like you stated before, change the bands on your Caranx and the shaft with that of a tuna version RA, and you pretty much have a RA TUNA 1300.

Now a 7mm is not consider to be a thin shaft by many spearos. I use the twin band set up in my caranx with out any problems, however I take 1 band off when vis is bad. As far as power goes you will get a faster shot with the 7mm spear & twin band set up.