May want to try an OEM barrel from Ebay.

During certain periods, Ruger barrels were hit or miss.

Another factory barrel may work OK; these could be late production, which would be good.

You could probably recover cost or close to what you paid if you changed your mind.

http://www.ebay.com/itm/Ruger-10-22-factory-Barrel-18-5-Barrel-/112426764696

http://www.ebay.com/itm/Ruger-10-22-Semi-Auto-Rifle-Barrel-22-LR-/361991046935

http://www.ebay.com/itm/Ruger-10-22-FDE-Duracoated-18-5-rifle-barrel-GUC-/112429208626

DF