Replacement nipples thread size

[WALKERs210]

I have somewhere in all my tools and cabinets two or more sets of Thread gauges, but typical when you need them they disappear. Anyway cutting to the chase, I purchased from KWHI43 a beautiful Uberti 3rd model Dragoon. I was going to orders a spare set of nipples for it but on different sites the thread size for the Walker and Dragoon's have one set 1/4 x 28 and then another in metric (don't remember the number). This Dragoon is dated 1979 so what would be the correct size.
Thank you in advance.

 

[mykeal]

The large frame Uberti revolvers (Dragoons & Walker) use the 1/4x28 threaded nipples.

 

[Hellgate]

I agree with Mykeal. Same thread pitch as the ROA and the ASM nipples too (12X28). The Dragoon/Walker nipples themselves may be bigger but that is the thread pitch of Uberti nipples. Pietta and Euorarms are 6X.75 nipple threads.