Futuristic Minigun need help with muzzle flash

Hello!
Here is a minigun I made yesterday:
http://i379.photobucket.com/albums/oo240/clewer/th_minigunpersp1.jpg
http://i379.photobucket.com/albums/oo240/clewer/th_minigunpersp2.jpg
http://i379.photobucket.com/albums/oo240/clewer/th_minigunpersp3.jpg
http://i379.photobucket.com/albums/oo240/clewer/th_minigunside.jpg

I need help with the muzzle flash.I tried it with particles but it looks like fire.How can I make meshes disappear and reappear during animation?
Thanks for the help!

Clewer

CanĀ“t see picture. You can make mesh disappear by putting mesh in different layer pressing ctr-l in ipo-editor.

Ok. Can see it now. Looks very cool.