This native removes a specified weapon from your selected ped.
Weapon Hashes: pastebin.com/0wwDZgkF
Example:
C#:
Function.Call(Hash.REMOVE_WEAPON_FROM_PED, Game.Player.Character, 0x99B507EA);
C++:
WEAPON::REMOVE_WEAPON_FROM_PED(PLAYER::PLAYER_PED_ID(), 0x99B507EA);
The code above removes the knife from the player.
This is the server-side RPC native equivalent of the client native REMOVE_WEAPON_FROM_PED.