So I'm putting together a list of components to build a new rifle. I want the rifle to be a 300 win mag long range hunting rifle which is as light as possible. I started throwing together a list of components, weights, and costs. Items which I am still unsure of are highlighted in red. If you see anything odd or have any suggestions please feel free to chime in. This is my first time doing this, so I'm no expert and as you can see I'm still unsure about some things and looking for advice.

After adding up all the weights, the gun is heavier than I thought it would be. Am I missing anything?

After adding up all the weights, the gun is heavier than I thought it would be. Am I missing anything?