The cylinder gap measures .006 on my 627-5 Pro Series and end shake measures .004. It's a new gun with only a about 300 rounds through it. I'll probably order a shim kit but my concern is the forcing cone apparently isn't square to the face of the cylinder. Using a feeler gauge from the left side the the gap is larger than from the right side. Is this very common and does it really matter? I know it bothers me. Is it something that S&W would fix? The gun has already been back to S&W to fix the messed up crown. Not too happy with the QC from the factory.

The forcing cone wasn't square on every gun I ever bought. They fit the cylinder gap with a file by filing freehand. That guarantees it won't be square, except by accident. The back end of the yoke tube is never square, either. It's been like that since the beginning, probably.

I have the tools to square mine, and stretch the yoke for endshake. It matters to me, but maybe I'm too picky (or maybe not).

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protocalldesign.com

Sadly, fit issues have become fairly common with S&W revolvers since the panicdemic. Since it is a new revolver, contact S&W for warranty service. Warranty service is part of the purchase price of anything that is new.

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VCDL, GOA, NRA

If you install a cylinder end-shake bearing do not use one larger than .002", there needs to be a small amount of clearance. So far as the barrel-cylinder gap is concerned it is very common for this to vary somewhat side-to-side. The gap is set after the barrel is installed in the frame. The end of the barrel shank is final-fit by hand filing, not with a reamer on a piloted shank, so the squareness of the barrel is dependent upon the skill of the individual fitter using a hand file! Almost all revolvers vary a little bit because of this. It is just how S&W does this operation! Not all fitters have the same skill or concern when it comes to performing this operation unfortunately.

Don't worry about the B-C gap varying slightly side-to-side as it has no effect on accuracy or anything else. Many worry far too much about small details like this, but most shooters have no idea what the gap is or how square!

In short, no, S&W will not fix that as it is not an issue! I see warren (Protocol) beat me to this.

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Gunsmithing since 1961

You can purchase the tools to square the yoke tube and the back of the barrel from Brownells. It is really easy to do. I use it on some guns and some are close enough and maybe used so little that I do not bother with it. Mostly on guns that I want the most accuracy out of.

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Richard Gillespie
FBINA 102

Thanks for the replies. Like Protocall I guess I'm overly picky but I'll just live with it. I have a 66-8 that I'm very happy with - it has a .004 cylinder gap and only .0015 end shake. Also the forcing cone seems to be square.