I have read a fair amount about "linear compensators" lately, so I decided to buy one. Fortunately I had a threaded barrel laying around that would accommodate the thing, so I thought I would give it a try. I was impressed. It resulted in a SIGNIFICANT reduction of noise. I was shooting at my regular LSG/Range and the sound between the dividers at the indoor range was noticeably lessened. It also SEEMED that there was less felt recoil, though with a 9mm that isn't necessarily noticeable or much of a big deal. Just thought I would pass it along. Its not as good as an actual suppressor, but it is legal and helpful.