I was shooting at a range last year and some kid with a tacti-cool gun had one; said it took a year. He was all excited, as I would imagine, and he shot the gun without the suppressor, then he said something like,"Now listen to how quiet it is with THIS!" He attached the suppressor. Now he had a small audience of about ten of us. He shot the gun, and it was just about as loud as without it! We were nice, didn't say a word. I swear his eyes were tearing up, pretty red-faced, he was picked off, embarrassed, and was totally beside himself. I felt bad for him. He took it off, looked at it, put it back on and shot it. This time I put my ears on, but not directly over them correctly. It didn't really make any difference! He put his stuff in the gym bag and left. I would've been ticked, too; all that money and waiting for nothing! It's always my goal to mess with people, but this was NOT the time. I never did find out what the problem was. But, anyway, he waited a year.
Bummer, man!