What would be the best type of barrel for my Spyder Sonix paintball gun?

I have a Spyder Sonix paintball gun and was wondering what type of barrel would be best for it. First of all, do all barrels fit all guns?(I mean the part you screw it into.) I dont know much about paintball because I just got into it. My friends keep telling me the longer the barrel the better, but I am not sure. What does a longer barrel do for you and how long should it be for my gun?

Spyder MR1 Paintball Gun Starter Kit B

Spyder MR1 Paintball Gun Starter Kit B

* Slide out pull pin
* Field strippable bolt
* Detachable stock
* Integrated dovetail for easy sight placement or for mounting a scope
* 12″ muzzle brake barrel

Kingman’s MR1, the first in a brand new series of Spyder Scenario style paintball markers! Spyder MR1 Features: Starter Package B Includes:

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Spyder Sonix 09 Starter A Paintball Gun Kit – Black

Spyder Sonix 09 Starter A Paintball Gun Kit - Black

This Kingman Spyder Sonix 2009 Kit Includes:1- Kingman Spyder Sonix 2009 Paintball Gun – Black 1- 20 oz. Aluminum Tank 1- Viewloader 200 Round Loader  1- Single Lens Paintball Goggle – Black  1- Cable SqueegeeNote:  We reserve the right to replace kit items with equal or greater value items if the pictured items are out of stock.

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