IF the barrel is short chambered you'll need a chamber reamer and a headspace guage, barrel vise, action wrench, and anti seize lube.. Plus a bit of knowledge. If the barrel is long chambered, you'll also probably need to add a lathe to that list. Also needed (possibly) is a depth mike or calipher.. and perhaps a counter boring bit for the counter sink on the end of the barrel for the bolt nose. A jig to retain the recoil lug in the correct attitude (verticle) is also very nice.. Other tooling to true the action and lap in the lugs etc. is not 'necesssary' but is a good idea for maximum accuracy.. There may be other tooling I'm missing,,, the old brain's not functioning too well...