Bill, years ago I was told this was the case but I never verified it especially with the cost of a model 70 bolt being so high. I do know as a fact that you can use model 70 bottom metal with just the addition of a tapped front hole onto the receiver as the model 54 front hole was in a different location. If memory serves me one has to work pretty hard to come up with a nice bolt stop however. Good luck...

Edward Lundberg, Colorado Springs