The very best option for a new barrel bushing for your series 70 is to order a custom made one from EGW in the US.You measure the inner diameter of your slide,outer of your barrel,send them the dimensions and 3 weeks later you have a custom fit bushing.The "angle fit" is best as it allows for the barrel swing down when the gun unlocks.Barrel/slide/bushing fit is very important for accuracy,my sloppy shooting Ruger really tightened up its groups with this change.Bit more expensive than just buying a drop in fit,but well worth it