SD Design Hi-Capa Chamber Thread Size
 

Does anyone know what kind of thread the SD Design Chamber for Hi-Capa 5.1 uses? I am trying to make a longer(slightly) custom straight barrel with a threaded end to fit a +14mm fitting to fit the silencer, but I don't know what kind of thread it is. I measured the thread pitch with a thread gauge and it seems to be either a metric Mxx x 1.0mm or a imperial x/x-25...which makes very little sense...I know the 14mm is a M14 x 1.0...