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Dear Sirs,

I just purchased a Colt Python Revolver with a 4" barrel. I would like to purchase a longer barrel for this gun. The problem is that two types of barrel threads exists. Old style and New style. My gun, according to the serial number, has an old style thread. Someone is willing to sell a 6" barrel. However, he is not sure what type of thread it is. How can these barrel threads be identified?

Thank You,
Pavel
 

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Changing revolver barrels is a process normally requiring gunsmith skills and equipment. Lathe turning the barrel shoulder is normally required to establish vertical alignment of the front sight when the barrel is fully tightened into the frame. At this point, metal would usually be removed from the rear of the barrel to establish a suitable barrel to cylinder gap of a few thousandths of an inch.

There is, therefore, more involved than simply matching the thread dimensions.

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"ArmaLube Hits The Mark"
 

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Didn't I answer this question on another board?

The old Colt E&I frame threads are .5634-32.

The Colt J, V, and AA threads are .562-36. This may be what Colt is using for the new Pythons. Call Colt and ask, or call Brownell's and ask.
 
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