ox-inventory Installation

Open the data/weapons.lua file located in your ox_inventory folder.
Add the following code snippet to the weapons file:

ox_inventory/data/weapons.lua:705

['WEAPON_TEARGAS'] = {
    label = 'Tear Gas',
    weight = 600,
    throwable = true,
},
-- Lines below
['WEAPON_SPEEDRADAR'] = {
    label = 'Radar speed gun',
    weight = 600,
},

Remember to restart your server after making these changes for them to take effect.