You can use two front Leupold MK4, the action is round on both ends. Seekins and Stiller both offer excellent one piece bases. I know you stated you didn't want a one piece, but Stiller and Seekins are both very good options. If you choose to go the Leupold route, you can send your two piece base back to them and they will send you two fronts. I found them to be very helpful, but in the end I went with a one piece base. I bought the Seekins, but Jerry Stiller installed one of his 20MOA bases on my rifle when I bought it and so I just left it on. I am very happy with the one piece base YRMV.