del1an
3
maybe… like this, idk 
MY_PED = GetPlayerPed(-1)
AREA = {}
AREA.x1 = 1700.0 -- max
AREA.y1 = 500.0 -- max
AREA.z1 = 40.0 -- max
AREA.x2 = 1500.0 -- min
AREA.y2 = 400.0 -- min
AREA.z2 = 20.0 -- min
RegisterNetEvent("BuyAmmo")
AddEventHandler("BuyAmmo", function()
if IsEntityInArea(MY_PED, AREA.x1, AREA.y1, AREA.z1, AREA.x2, AREA.y2, AREA.z2) then
--code
else
--code
end
end)