that makes more sense. you cant walk up with a gun like that, and i believe it was silenced from how long it was. so he needed a backpack he can draw from on his back. camera backpack, made for people who see wildlife and need to pull the big thing out without dismounting the backpack itself. can be returned to backpack similarly easy, without removing. thats a very high level of thought, although it also opens up the obvious vulnerability of low sales volume/uncommon item which makes tracking easier.
Nazi