Shim the endplay on the cylinder to bring it back into the recoil shield a slight amount. It is a MUST that you or someone for you reams all the cylinders with the "800-741-0015" reamer from Brownell's. Most of the M 617s that I have had on my workbench have what I regard as too small of a forcing cone. Tighten the strain screw or get a slightly longer one.
When shooting; bring a swab with a little solvent on it and clean the cylinder only after every 20 or 30 rounds fired.
Can't find a cylinder shim? Put a drill bit sized to just fit in the yoke tube and very slightly peen the end of the yoke tube. You might have to dress the peening with a very fine file. That will take excessive end play out just as well as shims. ........
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