Weapon entity index
Returns if the weapon is in silenced mode.
Only the USP and M4A1 can return 1 as they are the only guns in the game that have a silenced fire mode.
This native does not verify that the provided entity is a weapon entity. It will return incorrect values for non-weapon entities.
1 if the weapon is in silenced mode, 0 otherwise
If an invalid entity index or a client index is provided, an error will be thrown.