I have a Ruger M77 Hawkeye in 338 RCM with the current plastic stock. And the stock works fine as is, but I wanted change to a chassis system to make it easier to fit the rifle to me. I need a little more comb height. The challenge is that I have not found anything execpt GRS. Are they the only option? And it it considered just a stock (wood only no aluminum or steel embedded in it for the action to sit against)?