The only other thing I can think of is you will probably need a new magazine to get the .308 to feed if you aren't going to single feed it. You will also need a set of go/no-go gages,a barrel nut wrench and either an action wrench or barrel vice, some swear by one some by the other, take your choice. You will be surprised by just how easy it is to change barrels. If using the action wrench make sure that you don't have it tightened down so tight that you can't unscrew the barrel from the receiver once you have the nut loose, please don't make me tell you how I know this :-\ .