Wasn't sure where to put this as there are a couple Saigas and AK rifles, but there's plenty of other weapons too.
It's been instructive that while filming in night vision to see just how much muzzle flash is being produced on different guns.
Here's a little video I made showing some of the flash produced in a couple of my recent shoots.
http://www.youtube.com/watch?v=sd-izuuHFNw
The big surprise for me had to be just how much unburned powder there is from Wolf 7.62X39mm hollowpoints even after being put through a flash suppressor or a silencer (AAC Krinkov).
Some of the others are somewhat massive but no surprise as I've been filming with a Gen 3 NVD for a while now. Except maybe the Serbu Super Shorty.... We only caught 1 out of 3 muzzle flashes from that fire monster as the NVD would wink out. But, for what you can see only surprises me in that we didn't burn all the hair off our hands.
Enjoy,
Frank