SF7 is not a serial number.
http://www.savageshooters.com/attach...8&d=1327338525
Small shank barrel is on the left. Notice the step in the shank of the large shank barrel on the right.
http://www.savageshooters.com/attach...9&d=1327338746
Small shank again on the left, notice the difference in length of the barrel nut.
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