1. create custom animations with the weapon bones
2. create an item inherited from Inventory_Base
3. add CustomBoneRemapping
4. run the animation

! add bone remap for item class
! pBoneRemap has always 2x N members
//! bone in item's P3D first, bone in Character skeleton second

! array<string> remap = { "bolt", "Weapon_Bolt", "magazine", "Weapon_Magazine", "trigger", "Weapon_Trigger" };
! AddItemBoneRemap("class", remap);

proto native int AddItemBoneRemap(string pItemClass, array<string> pBoneRemap);

its mention item's class, we were expecting to make it work on all items, that would be in player's hands

video contains working animation when its inherited from Weapon_base