The muzzle flashes have been remastered in this addon, with sparks and smoke.
The textures are animated, which means the frames are different possible textures. So instead of 4 possible muzzleflash textures, there is over 40 possible textures, and even more combinations.
Turn off HDR otherwise the muzzleflashes will be much brighter, unless you like that then whatever.
This should have about as much impact as the vanilla muzzleflashes do.
Conflicts with addons that replace the muzzleflash textures.