Quote: "BTW: Why do I have to load a new round of ammunition when I attach/detach the silencer, that it's really necessary ?!?"
It looks like the ammo count in the gun changes when switching modes...
So, I suspect it is because he doesn't have the ammo being shared correctly in gunspec or didn't know about the option and animated the weapon based on an assumption that magazine ammo could not be shared.
This is the gunspec setting needed if maintaining loaded ammo between modes:
shareloadedammo = 1
Useful for silencer swapping, RoF changes, etc.
Gigabyte P67A-UD4-B3, Intel Core i7 2600K (passmark 8555), 16GB Corsair DDR3, EVGA GTX 970 SC (passmark 8637), Win7 Pro 64-bit SP1, Primary monitor @ 1920x1080, secondary monitor @ 1024x1280