I have the 12" silver barrel and it works great. I got it with my Ras Intruder Atx. My Intruder kicked the crap out of my friends m98 and my other friends F-4 Illustrator in an accuracy test. The balls were going perfectly strait and it works great.
It is a bit loud but that is because all the the holes are at the end of the barrel in the muzzle, or whatever that is called.lol
This barrel is great and comes with a Ras Intruder Atx right when you buy it. You don't need to upgrade it or anything. Great barrel.