I can confirm that Acquasport is a shop that covers all spearfishing/freediving needs including advice by personnel that actually use the material they sell. However, Maremania in Milano is also a first class:
http://www.maremania.info/index.htm As a matter of fact, the shop is much bigger than the one in Grossetto (Acquasport) and the owner Ahmed Awad is a spearfisherman himself and a frequent contributor to PescaSub, THE Italian spearfishing magazine. Ahmed also offers to customize any speargun purchased in his shop according to your specifications.
Cheers, Ulysses
