Doesn't "tip-off" generally refer to the mounts that clamp onto a .22's grooved reciever?
For your M/S, since the reciever bridge is slotted to allow the bolt to move to the rear, I think that they usually use some kind of side mount base. Maybe the seller is thinking of the Weaver "pivot mount", which allows the scope to be swung out of the way, in order to use iron sights ( kind of common back in the day when scopes were not real reliable..weather proof ). Pachmeyer ( sp ?) also made a pivot style, and Williams made alot of side mounts for various rifles.
In any event, if the mounting system appears to be of good quality, not something "bubba-ized" to fit, it should work fine, I would think.
Mark