Eh. To be honest that thing is really all bark and no bite. Its loud and obnoxious, but it wont hit anything you couldnt hit with your rifle. However since CQB and MOUT tactics are based upon SURPRISE, SPEED, AND VIOLENCE OF ACTION. It definitely sounded violent.
Dont be afraid. Its only a game and its all in good fun. I will be at battlegroundz in attleboro this friday night with a few team members doing some drills. Feel free to stop by.