FX Panthera Hunter/FX Dynamic how loud?, how to quiet?

Obviously, this new crop of FX guns are pretty long even in the shorter hunter versions. I have not seen much in the way of how loud these guns are and what it takes to quiet them. Is the muzzle threaded 1/2-20 and does anyone have any real world input as to what length of suppressor will be needed to quiet each caliber? If it's going to take a 10" long suppressor to suppress even the shortest models at around 39, the gun/moderator would be 49", which to me would be a deal breaker as a hunter-it would be just too long.