WMX also has a new texture for the Laser RCW's Composite Stock weapon mod; it would need to be altered too.
Then the textures have to be recolored. Still quite simple, only Gimp + DDS Import needed. May take ~30 Mins max. for so someone who did this never before.
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A laser "silencer" doesn't make much sense, really, unless the laser spectrum is red/blue-shifted out of the visible light spectrum. Since projectile changes can't be done...
Even a shift would silence the laser. High powered laser beams aren't really silence, they make a clearly audible noise. Also the air around the beam would ripple, even when the beam is invisible.
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If you want a truly silence a gun, you'd also need subsonic ammo. That would mean lower grain count (lower damage in-game) for nearly everything except something like .45 ammo. Even then it's still louder than the Hollywood style silenced weapons.
For the laser, if you're going for realism, the beam should be invisible (unless it passes through a dust cloud) making it inherently "silent".
Even with subsonic ammo a gun would not be completely silent. Moving parts of the gun would still make noise. Every guns which is faster than ~330 m/s would need subsonic ammo which reduces damage but also reduces the firing range of the weapon.
An invsible beam would be more realistic but many players wouldn't like the effectless nonvisible beam, also it still will not be silent.
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'Fatman Upgraded Hydraulics' it is, then.

I was probably thinking of this launcher weapon from relatively early last century I saw in a documentary once, that looked an awful lot like the Fatman. It actually
did use springs, from memory - though they said it proved to not work very well. I think this was some time before the panzerschreck and the bazooka and whatnot. But don't quote me on that.
The Idea behind the Fatman would be the Davy Crockett Nuclear Device, details can be found here: http://en.wikipedia.org/wiki/Davy_Crockett_%28nuclear_device%29
regards,
Mr. J