>>1005505
Use the armature constraint, it's great for parent switching. note that whatever bone has the armature constraint shouldn't be parented to anything or you might have some issues.

you can use it on your weapons to parent them to your hands, you can use it on your hands to parent them to other parts of the body, you can use it on your ik poles to parent them to whatever is convenient, it's one of the more versatile constraints.