Thread size for Suppresor ?

[Ridgelinenz]

It depends on your barrel thickness. In general you want the largest thread you can get. I have seen accuracy drop because someone has put a 1/2inch thread on a barrel that should really be M14. The threaded end “flares” out. The only way to fix it is cut the barrel before the flare.

This isn’t the same case for the factory threaded barrels like the Howa’s.