The Tac-5 is actualy made by JT, which is a division of of brass eagle. Its a basic stack tube blow black aka spyder. Its a decent beginner gun.
Personally I would spend an extra $30 and pick up this deal.
~$~$~ LNIB cocker package! Great deal!~$~$~
Another good deal at only $60. I own two of those guns and they are good guns. You can probably pick it up for $60 shipped.
Spyder TL with extra <(~.~<)
It will perform a whole lot better and you will be much happier with it if you intend on sticking with the sport.
As already stated rifled paintball barrels do nothing really. Having the correct size barrel will do you more good than a rifled barrel.