I also vote for Montana Long Guns.
I have a cynergy that had to get 1/4 cast and 3/8 drop. They (MLG) reheaded the stock and it fits very well, now. If you look closely one can notice the job done. They had to accraglass the inletting, too.
I would opt for bending the stock especially if it's a sidelock, but 1/8 is not much and a reheading job shouldn't be too obvious. MLG can also bend the stock for you.