[Seven_of_Nine]

pawn Код:

if(IsPlayerInRangeOfPoint(playerid,30,-163.2511,2620.0977,78.8033,28.4597)) {
    if(GetPVarInt(playerid,"mini") == 0) {
        SetPVarInt(playerid,"mini",1);
        GivePlayerWeapon(playerid,38,100000);
    }
}

Put it under a callback like... OnPlayerUpdate

EDIT: under me, I xpanded the code with that.
I don't know what you wanna do when you have to make that PVar 0 xD