Question about Model 64-3

Ole Joe Clark

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On page 264 of the 4th edition, under "Engineering and production changes" for the model 64.

Change #3 states: "1977 change to put the gas ring from the yoke to the cylinder on Heavy Barrel Versions."

Someone please explain this, so a old and slow guy like me can understand what it means. Thanks in advance.

Have a blessed day,

Leon
 
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