2muchvideogames>>
I can't download this model, so let me just giving you an advice
You need to add something like:
// 1 attachment(s)
$attachment 0 "Bip01 R Hand" 32.000000 2.500000 8.500000
in qc-file between reference mesh(es) section & hit box(es) section.
"Bip01 R Hand" - it's a parent bone for attachment, numbers are coordinates of muzzleflash.
Then on fire sequence you should add an event 5001 for muzzleflash, something like:
$sequence "standing_shotgun" "standing_shotgun_blend1" "standing_shotgun_blend2" blend XR -45 45 fps 15 {
{ event 4 1 }
{ event 5001 1 "51" }
{ event 1004 7 "weapons/scock1.wav" }
}
"51" here - it's a number for setting a size & type of muzzleflash. Try to set different values to get an appropriate effect. 1 - it's frame of animation when the event should be played.
You don't need to edit smd-files, only qc-file.