You can try using a set mesh node for the duration of the magazine switch animation. That’ll be a quick fix! But if it looks off, you could make your own by adjusting them from a 3D editor like Blender yourself and importing them back together as a single animation. Alternatively, you can also find many 3rd person shooter animation packs online if you’re struggling to find one for the 1st person. You could just choose to use the arm and weapon parts of the mesh.