Are you asking about a Savage prefit barrel or a Rem 700 prefit? If its a Savage they come completely chambered so you will need the action/barrel tools for the Savage barrel nut system and some go/no go gauges. If it's for a Rem 700, I'm pretty sure they come "short" chambered so you will need a lathe, reamer, go/no go gauges etc to get it together.