I'm a little late making a suggestion, but Cybertenko has one in the Wasteland Weapons: Survivors Backpack that parents to the backpack or can be loaded individually. I only mention it because somebody might need a backpack or other items. I think it is just a prop and doesn't have any movable parts, but it does have a pose for the hand and is a smart prop.

https://www.renderosity.com/mod/bcs/wasteland-weapons-survivors-backpack/119150/

Poser 2, 3, 4, 5, 6, 7, 8, 9, 10, Pro 2014, 11, 11 Pro