I took a rifle to work on nightshift and got my mate to fire it in to the burning booth whilst I stood behind a steel screen, Firstly with no mod, Then with the mod fitted, I can tell in all honesty that the moderator made a hell of a difference down range!, My mate didn't belive me so I had to shoot whilst he listened downrange!, He had to agree!
It sounds the same for the shooter as there's all the mechanical noise next to the head that's directed to the ears but the blast is travelling away!
John
for my gunz guitarz and bonzai, see here
www.flickr.com/photos/8163995@N07/