hi I just got a red invert mini aswell and ordered a UPZ GLADIUS off ebay, basically because it looks so good and the price
I didnt really know what I was looking for when i got it , stupidly. It looks great on the mini, even though the barrel is a slightly different shade of red than the gun.
http://www.pbreview.com/products/reviews/5735/ < this one but mine has loads of tribal designs all over it which you can choose on ebay. UPZ are like a new american paintball company setting up so they got cheap products atm. I mean it will probably not be as good as the PRO barrels but people seem to think its OK and i love the style.