The issue with the weapon was having the ‘Weapon’ component hooked into the master pose stuff. As pictures below, by leaving them not hooked up it fixed the problem.
My best guess is because the weapon doesnt have a full skeleton bone setup that matches the character’s bone setup, it cant follow along? I dont understand how all that works yet but i did manage to get things to work. Once i fixed that issue i went and removed the Weapons ‘child skeletal mesh component’ and used ‘Weapon’ component where applicable and now it all works as it should.