I too have an early 1980's 25-5 with an 8 3/8 barrel, pinned
and recessed. I have a set of digital calipers that can
measure inside diameters. Now, just to clarify, the throat
of the cylinder is on the front end of the cylinder about a
1/4 inch or so going inward? If that's the area, mine measures
.452 ", which is good. The serial # on my gun is N7160xx.
If I'm wrong, please let me know.
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