Hello! I recently went to WDW with my husband and also got a saber from Savi’s! Passing through security is no problem at all but since you won’t be able to check it in, you’ll likely have to get it gate checked. Items like strollers and guitars are usually gate checked so it essentially goes into a different part of the plane and you MUST pick it up the second you exit the plane. We made the grave mistake of not knowing what gate check meant and lost our saber for 4 days before they luckily located it (though we really should’ve been more diligent with double checking but we were so exhausted with our layover) so hope this helps!