I purchased a very gently used Winchester 70 in 7mm Rem Mag. It came with a cheap synthetic stock with a blank magazine. I want to replace it with a Bell and Carlson stock. The blind magazine stock has three screws, two from the trigger guard and one from the stock into the receiver. Are all M70's equipped with three screw lugs in the receiver and action? Can I safely go to 2 screws in a one piece floor plate? Thanks!