Donut
Member
The hard part will be catching a good image of the muzzel blast while still being able to tell what kind of gun it is, so too slow a shutter speed will blur the gun because of its kick
Which is why you use a flash and drag the shutter. The flash freezes the foreground (shooter, firearm) pre-muzzle flash, and then allows the flame to to develop under it's own light.
Look at Oleg's shot. Does it look "tacky"? As long as you have the white balance set properly - or better yet, shoot it in RAW - the colors are going to come out natural with the flash.