has anyone here seen this. Called high performance gun barrel. by ASA 'american safe arms'. seems to be a barrel length tube outside the barrel with the barrel having gas ports about 2 inches from muzzle. gas vented to tube lessens recoil by about 40 to 50 percent. doesn't increase report and definitely not to the shooter. for about $250 this would seem to be a sweet ticket to reduce recoil on some of the harder kickers. I was wondering if anyone is familiar with this. Thanks don.