According to Winchester, the 350 Legend rim diameter is the same as the 223 Rem, so your action with current bolt should be good to go.
However, case dimensions are sufficiently different that the 350 can't use the 223 magazine reliably (according to Winchester and members on this forum). So you will need a barrel and 350-compatible magazine. Also, tools needed to perform a barrel swap if you plan on doing it yourself. If you need it there is lots of info on how and how not to perform a barrel swap on this forum).
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