How to let right hand get off grip and pull rifle bolt when making reloading anim with control rig?

Development Character & Animation
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1

I’m making a reloading anim with control rig. The gun is bind with char on hand_r bone.
When a new magazine is inserted, the right hand needs to detach from the grip and pull the bolt to load the bullet, but the gun is bound to the hand_r, How to make the right hand detach from the grip while keeping the gun from moving with the right hand bone?

2

You could use animation notifiers that control when to attach/detach.

Usually better to use a dedicated bone for attaching what ever item is supposed to be in hand. In the case of the UE4 mannequin, ik_gun_hand is always an option. No need to juggle animation notifiers then.