Even though it's not listed on their website, I have an email from Brown Precision stating that they will make one for a MKII. They had one at an Expo I attending 3 years ago as well. Might be worth a look.
Though I don't know how much work it took or what it cost, a member (338RCM I think) here had a gunsmith alter a Bansner to fit a MKII.
