X-2 on the B/C M40 . I have had 2ea of the Boyd's Thumbholes and they are a very good stock but the thumbhole was set to far back for my hand and I had to stretch to get to the trigger and it will have to be bedded as they are a bit loose, once again they are a fine stock and if you have a large hand it will be fine, Take Rose's advice on sealing it up and you'll be good to goOP...get the bell and Carlson M40 stock on stockys. It's less than $300 shipped to your door and is an extremely comfortable bolt in design with an aluminum bedding block and clean looks. It'll also support up to a sendero barrel contour, but still has enough meat to open it up for larger contours.
Also remingtons rule and savages don't!!
Jk...I own both.