That Huntsman tuner is very popular with the bench rest shooters that share our range, I have a Starik carbon tuner on my rifle for prone use but they have to be ordered online from the EU
https://www.starikshooting.com/shop/starik-carbon-tube/There are a few stores that can get them for you but they don't carry stock as each one is custom made for your rifle and it just pushes the cost up.