I just ordered a new Marlin Model X-7 in .223 today. I should have it Tuesday. I know they include a scope base, but I'm looking for steel bases rather than Aluminum. My question is will bases for a Winchester Model 70 short action fit? Or is the screw spacing different? Not too much is listed for the X-7. I'm thinking of the Warne 2-Piece steel bases, along with Warne rings. I would also be happy with a one piece steel Picatinny base. Also, is the screw spacing the same for XL-7 and XS-7?