myy god...
Now the thing is it still won't be a silent kill, say for instanst theres two grunts, one in front of the other, facing the same way, away from you.
If you shoot the one closest to you, the other grunt will here the shot, turn around and start firing, you'd have to edit the dll to fix this problem, even though you'll here a silenced fire, the grunts will still react the same way as a normal glock.
Google Half-Life Models