How would I tween this?

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So, I’m using the Roblox gun system, and I was making aiming, but I came across an issue. I want the view model to be at the point that you are aiming down the sights, and I did that, but I want to tween it.
code:

for _, instance in self.toolInstances do
		instance.LocalTransparencyModifier = 1
	end
	

	-- View model bobbing animation
	local moveSpeed = (self.handle.AssemblyLinearVelocity * Vector3.new(1, 0, 1)).Magnitude
	local bobbingSpeed = moveSpeed * Constants.VIEW_MODEL_BOBBING_SPEED
	local bobbing = math.min(bobbingSpeed, 1)

	self.stride = (self.stride + bobbingSpeed * deltaTime) % (math.pi * 2)
	self.bobbing = lerp(self.bobbing, bobbing, math.min(deltaTime * Constants.VIEW_MODEL_BOBBING_TRANSITION_SPEED, 1))

	local x = math.sin(self.stride)
	local y = math.sin(self.stride * 2)
	local bobbingOffset = Vector3.new(x, y, 0) * Constants.VIEW_MODEL_BOBBING_AMOUNT * self.bobbing
	local bobbingCFrame = CFrame.new(bobbingOffset)
	local CF = Constants.VIEW_MODEL_OFFSET
	if self.blaster:GetAttribute("_Aiming") then
		print(self.blaster:GetAttribute("_Aiming"))
		CF = CFrame.new(0,-1.25,0)
	end
	
	
	self.model:PivotTo(camera.CFrame * CF * bobbingCFrame)