I guess that GiveWeaponToPed, SetPlayerCurrentWeapon like server-sided RPC natives are not working. Does RedM support RPC natives like in FiveM? I tried to use GiveWeaponToPed in many ways, I mean just tried different parameters or hashes, but not working at all.
No official support for RPCs at this time. No ETA either and this is something that anyone can contribute to. Some will work, but not all.