Step 1 is to call a local police department, ask them to trace the serial number to make sure the gun is actually legal and registered to the person you are buying it from.
Step 2 if to write out a bill of sale with all the details and sell the guns to each other. Be sure to include copied drivers licence pictures from each party on the bill of sale itself. If I remember correctly, that's all you need to sell a gun in this state.
Hope that helps!
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