The dual port action moved the rear bolt forward eliminating the half pillar normally associated with Savage actions. The also use a different trigger guard from a model 40. The dual port action still has the rear action screw hole drilled but it would need taped to work. If you taped the whole then it would use the same spacing as a standard target action. I personally like the spacing better on the dual port. Read the article I did on the 12 benchrest on this site it may better explain this.
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