This barrel is sweet. It looks awsome and has great accuracy. It didnt really make my Piranha much quieter but that aint a big deal to me. It is a bit expensive but I think that it is worth it.
The only thing I can think of bad about this barrel is that it breaks cheep paint easily and sense I got the 16" it is a pain to clean in the middle of a game. Just get good quality paint and you wont have any problems, I use Marbelizer paint and hardly ever break any paint as opposed to when I used Brass Eagle (I know I know, my bad) and had to squeejee the damn thing every 3 or 4 shots!! Also it is a bit expensive.
This is a great barrel and is available for most any gun so go and get one!!