[Kwarde]

pawn Код:

#include <a_samp>

forward MakeWeaponForPlayer(playerid, weaponid, ammo);

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(!strcmp(cmdtext, "/makeweapon", true))
    {
        if(GetPlayerInterior(playerid) != 0)
        {
            SetTimerEx("MakeWeaponForPlayer", 1800000, false, "idd", playerid, 1, 1); //Give 1 brass knuckle
        }
        else return SendClientMessage(playerid, 0xFF0000AA, "You're not in an house (interior)");
    }
    return 0;
}

public MakeWeaponForPlayer(playerid, weaponid, ammo)
{
    GivePlayerWeapon(playerid, weaponid, ammo);
    return 1;
}

Maybe this will work
To use the timer:

SetTimerEx("MakeWeaponForPlayer", 1800000, false, "idd", playerid, WEAPON_ID, AMMO);

idk if it's working.. just try it