So the Levang comp. How much flash? How much noise? I recorded some video this week. You be the judge. Remember, I'm thinking in a close quarters encounter, flash-and-bang are not a bad thing. If the perp isn't sure he's hit, at least his ears and eyes will be telling him it isn't wise to get any closer.
The video: The first two sequences are testing with only two rounds. Then an 9 round sequence. The camera is only recording one picture every 1/30 of a second, so it doesn't always correspond to the exact moment of maximum flash. (Okay 29.97fps for you purists.)
Listen to the guys on the other bay, other side of the room, chattering. They stop after my first shot.
The Slo-mo segment is only recorded at 30 frames per second as well then slowed down. This isn't Shooting Gallery with their 12,000 fps camera, so again, some flashes don't get captured, but I thought you'd like it.
Not the biggest or brightest, but an example of the muzzle flash caught in a single frame.

[UPDATED 5/14 ~5pm]
Here's a better picture at the moment of maximum muzzle flash.
