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Got a brand new Colt base pin and base pin bushing that I told seller was for 1st gen. The base pin measures diameter .2513" which is bigger than my 1st and 2nd gen. revolvers and the pin will not go into the frame hole. Also, when the bushing is put into the existing cylinders the cylinder will not fit back into the frame as it is slightly too long. Any thoughts? Do I have a 3rd gen pin and bushing maybe?​
 

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Got a brand new Colt base pin and base pin bushing that I told seller was for 1st gen. The base pin measures diameter .2513" which is bigger than my 1st and 2nd gen. revolvers and the pin will not go into the frame hole. Also, when the bushing is put into the existing cylinders the cylinder will not fit back into the frame as it is slightly too long. Any thoughts? Do I have a 3rd gen pin and bushing maybe?

The base pin bushing is "a MUST FIT part"they're made longer to stop the "end shake" of the cyl.-RE;the base pin,u either have the wrong size or it may not even be a Colt base pin but made for a different SA.​
 

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You have to face off the front end of the bushing to fit it to the frame. If the new base pin is oversize and won't fit the frame holes, but does fit the bushing then you need to replace both parts and not just get a smaller diameter base pin.
 

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A metal lathe would be the most accurate way. The bushing has to be short enough to enter the frame and long enough to maintain a cylinder to barrel gap when cocked. Without the proper gap the cylinder face will rub on the breech end of the barrel. Too much gap and you lose gas pressure.
 
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