Hello folks.

Was at the gun show yesterday hoping to find a Ruger Security Six, but all I found was one fixed-sight [police] Service Six in .38 special. Was pretty clean in good shape, but in the .38 and not the .357. Fellow was asking $365.

My question, can a .38 special Service Six be converted to a .357 mag? YES, they have the same bore size, and I realize a ton of details and other questions come with that one too, but what I really need to ask/know .....

Are the frames the same size on the Service Six? Speed Six? Security Six?

If the answer is "No," no sense in trying to proceed any further.

But if the frame sizes are correct. "possibilities" then become available.

I realize several things would have to be addressed besides just swapping out a .38 cylinder for a .357 cylinder.

Do all the Ruger "security" revolvers have the same frame size?

Anyone reading this thread, who is intimately familiar with the old[er] Ruger "Security" revolvers, could a [police] Service Six be converted to a Security Six? Thank you!