I have an FAL with 9/16 x 24 left hand threads on the barrel and would like to replace the flash hider with a 5/8 x 24 unit. I cannot find any adapter for this or any suitable units in this thread pitch.
Call the silencershop they have some resources to adapt to the FALs LH. I bought one that adapts to a QD. I haven't filed for the silencer yet but I did get the adapter to play with.