Since you don’t have any existing mag box, You’ll need to give a little more info about the action to determine which style magazine is needed, staggerfeed or centerfeed.

Is it a newest model 110 bottom bolt release that is a short action(4.400” action screw spacing), a model 10 short action(4.400” or 4.275” action screw spacing), an older 110 intermediate short action(4.522” action screw spacing)?