Sharp Shooter Supply 419-695-3179 has your bolt heads, wrenchs etc. also does prefit barrels is a Savage "specialist" so to speak. pre threaded and chambered barrels are available now from many major barrel makers, Douglas, Pac-Nor, etc etc, I rec SSS for the change over parts particulary if your not up on this as they will advise and make sure you don't end up with a late model pin and early model bolt head or vise-versa.