I have a 629 with a 3 in barrel. I purchased a 4 in barrel to replace it with. My 629 doesn't have a pinned barrel. The 4 in barrel that I bought has a grove cut in the top of the threads that makes me think it is for a pinned frame gun. Can have it installed in my non-pin frame without problems or am I asking for trouble? Thanks to everyone who replies for your time.
The barrel threads on all N-Frames are the same so a pinned barrel can be installed on a non-pinned frame and ViceVersa. That said, unless you have the special tools and know-how to do the job, it's best left to a professional. Otherwise, you can easily turn your M629 into a paperweight.
Do the 3" and 4" N-Frames take the same length ejector rod assembly?
I just checked and the ejector rod and center pin for 3" models have part numbers different than those for 4" & longer barrels so if you plan on a swap, looks like you need more parts.
Generally, you'll find it's more economically feasible to sell your 3" gun and buy a 4", especially when there is more involved than just a barrel swap.
Thanks everyone for the replies. I am planning on having a local gun smith do it, but I wanted some unbiased opinions on if it would work. Yes, the ejector rods are different, and I will have to purchase another one. I have already invested money in a trigger job on this one, so I am not inclined to try and sell it and buy a 4"model. Besides, it has a non-fluted cylinder and I don't see too many of those around.
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