SRIV Swapping Weapon Effects

I was able to use Notepad++ to change the weapon effects of my stun gun in SR3, but I appear to be having problems doing the same thing in SR4. In short, I want to change my stun gun into a laser pistol. In SR3, all I did was swap the muzzle effect values from the STAG laser rifle, with the stun guns muzzle effect value . When I tried to do the same in SR4 the weapon effects don't take hold in game.

Can someone please tell me how to change the stun guns muzzle effects? I just need to know if there's a step I'm missing, or if changing values is different in SR4.
 
SR4 added the weapon costumes and I bet the information moved to a costume table somewhere. Check out weapon_custumes.xtbl. The costume can alter lots of things like brass, muzzle flash, etc.
 
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