Simple take down, line up the notches and push the pivot pin out on the left side. I recently stripped my 639 after about 10 years. Mainly to replace the recoil spring. After thousands of reloads it took a few swaps of #9 in the nooks and corners to make it good as new. A dab of Tetra on the rails and it should be good to go for another 10 years.
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