i want a replica of the tool model to strap to the back of the player after its unequipped in this specific way:
anyone know how?
I suggest you go about this using Welds
Having a weld in your character’s Torso part, and set the part you want to weld to your torso, in this case your gun:
You can tweak the position and orientation from the C0 attribute values to get your desired unequipped gun position on the character. (it is a bit tedious)
You can probably try enabling/disabling this behavior with just simply setting the Enabled boolean of the weld true or false depending on whether your player has equipped or unequipped their gun.
Or perhaps having a dummy clone of your specific gun in the character hierarchy, welded to the torso, and only shown while the gun is unequipped, otherwise hidden.
Again this is just an idea from my part, and there are probably completely different ways you could go about this that suits your needs best.