GIVE_WEAPON_TO_PED

Example in C#:

public static void GivePlayerWeapon(int playerid, WeaponHash weapon, int ammo)
{
            if(Function.Call<bool>((Hash)0x8DECB02F88F428BC, playerid, (uint)weapon, 0, true)) // Has ped Got Weapon
                API.SetPedAmmo(playerid, (uint)weapon, ammo); // will give only ammo 
            else
                Function.Call((Hash)0x5E3BDDBCB83F3D84, playerid, (uint)weapon, ammo, false, true, 1, false, 0.5F, 1.0F, false, 0);
}