Muzzle flash animation not working on repeator mod

[KalMac]

Hi guys I'm working a mini mod for SP to change the primary projectiles for the Heavy Repeater to be blue with a glow effect instead of plain yellow (a bit like the original one from Dark Forces) but I cant seem to change the muzzle flash animation to a new blue one.  Instead I get no muzzle flash animation but everything else works perfectly.  Any tips or ideas would be much appreciated as I cant see where I've gone wrong.

Cheers