Mausingfield ejection port location is slightly different from an M700. Legacy versions also have a side bolt release/ejector assembly that requires the stock to be fitted if the action radius sits at the showline. The bolt handle inlet on stocks meant for a 700 is also typically very different from what the Mausingfield needs/wants. It has a straight handle that runs perpendicular to the bolt body. In most instances, they'll work, but the presentation (IMO) leaves a bit to be desired.
I threw this assembly together quick to illustrate what I'm trying to describe. Hope it helps. The "ghosted" geometry is a Gen I Mausingfield. The solid is the M700. Note that later Mausingfields use a different style bolt release that avoids the stock work I described. The port geometry, however, is still different.
C.
