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p0838

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Is there a hole or indentation on the underside of the top strap(just above the barrel forcing cone) which lines up with the forward holddown screw of the sight?
 
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Yes, it's the hole for the sight screw, it goes all the way through the frame. My 66-2 has the hole just above the forcing cone. My 66-4 has the hole just back from the forcing cone, where it's easier to see, plus two other factory drilled through and tapped holes for a scope.

Seems kind of weird for S&W to drill holes in a somewhat critical part of the frame, but apparently it's not a problem.
 
Here's a picture of the hole on a 66-4, it will be the same on the later versions too.
newsightts.jpg

On the earlier versions (66 thru 66-3), there were no screw holes through the top strap.

I doubt the holes through the top strap on the -4 and later 66's are a problem but it does cause carbon to build up on the outside of the cylinder that I'm not fond of.
 
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