How to make camera pitch affect arms on mesh but not body

Development Asset Creation
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1

I am making first person shooter and when i look up i want the mesh arms to also look up but not the body only the arms and head. There is one mesh

2

surely there are lots of different ways.

by default rotation of a pawn is effected by its control rotation based on APawn.bUseControllerRotation*** you set.
see APawn.FaceRotation, it just simply sets the actor rotation.
you can override that function or just leave it and do your own stuff in Tick.

I personally set APawn.bUseControllerRotationYaw to true and adjust the Arm Pitch in Tick function.

FRotator armRotation = ArmMesh->GetRelativeRotation();
armRotation.Pitch = GetControlRotation().Pitch;
ArmMesh->SetRelativeRotation(armRotation);