Higher gas efficiency, more constant gas flow into the valve, looks cool.
Difficult to create a good seal against the valve
This will increase your gas efficiency and help keep a more constant flow of gas entering the valve.
Pros: Higher gas efficiency, meaning more shots per bottle. More constant gas flow into the valve, meaning, more constant ball FPS. It also looks cool, and the new location makes it so that you don't have to use the chamber as a grip, because it gets really cold as you shoot, if you're using CO2.
The expansion chamber helps any liquid gas, mainly CO2, to turn from liquid to gas before it gets into the valve. This is most applicable if you fire a bunch of shots quickly or if you're playing in colder weather. You WILL have a liquid gas issues if you play in colder weather, which will cause you to run through bottles very quickly, this will remedy that.
Cons: It's a little expensive. With the new valve system, sometimes its difficult to get the new style of gas line to seal against the valve. But if you can get it to seal, it'll work great.
I would recommend this. I think it's worth the price especially if you're playing with CO2 or in colder weather. The trick is getting it to seal against the new valve. Pretty much just tighten it up by and and jiggle the thing until it seals. Its not to hard.
9 out of 10
Last edited on Saturday, June 5th, 2010 at 11:41 am PST