I have not been able to find data on metric sized barrel plugs for pistols.
Pitch in the USA is measured as how many turns are required to move a nut 1 inch. Metric pitch is measured as how many millimeters a nut moves for 1 turn.
I compared the thread sizes used by Greenmountain and Rayl with the available metric taps and dies. The result was these two tabels. Thought they might be of help to someone.
![](https://i73.photobucket.com/albums/i202/rolfkt/tabeller/tabeller004.jpg)
![](https://i73.photobucket.com/albums/i202/rolfkt/tabeller/tabeller003.jpg)
Best regards
Rolf