@sitka - for the M77 MkII’s and Hawkeyes, SOME mag boxes will be free floating with just a bit of relief work in the two notches at front and back, where the box “sandwiches” between the action and the trigger guard, and action and the floorplate base. SOME magboxes will need the edge relieved all the way around to eliminate contact against the floorplate when closed. Just look for the contact points, and relieve where it needs it. You’ll be able to tell very easily. It’s also a non-critical fit area. Sure, you can take off too much, but it’s pretty hard to do so, and you have to take off a LOT too much to cause any issue.