Why does this weld script not working?

plr = game.Workspace.LocalPlayer
weld = Rotation.Vector3.new

local foundarm = plr:FindFirstChild("Left Arm")
if foundarm then
	foundarm.Name = "LeftArm"
	local arm = plr:FindFirstChild("Right Arm")
	if arm then
		arm.Name = "RightArm"
	end
end

plr.Handle.RightArm.weld(0, 15, 0)
plr.Handle.LeftArm.weld(0, -15, 0)

It won't work. It's for my gun. I don't see ANY errors.

1. There is no weld nor can you do weld(0,0,0) And you did plr.Handle.RightArm you can not. Because it is trying to find a handle inside the player.