Over sixty real muzzle flashes from a rifle, pistol, and SMG, now in transparent still image format. Just drop them over your footage, make them one frame long, and position them over the end of the gun. These even work in iMovie using the "Picture-in-Picture" mode! They also work in Photoshop, in case you need them for a webcomic or any other artwork.
We include a couple of "glows" that you can drop over the flash for quick-and-dirty extra illumination.