Iv had alot of luck with the Rap4 Recon barrels, you can get them in both 7/8ths and 1inch, there rifled and the end has an screw on attachment point for mock silencer, and all kind of muzzle breaks.. i have the 8 inch one and its a tac driver, the 6 inch one would be great too. the price is right as well.

Paintball News - RAP4 Recon Rifled Barrel