local playerHead = game.Players.LocalPlayer.Character.Head -- the players Head

for i, v in pairs(game:GetService("Workspace").Weapons.MP5k.Hitbox:GetDescendants()) do
    if v.Name == "TouchInterest" and v.Parent then
        -- we will fire the touch event
        firetouchinterest(playerHead, v.Parent, 0)
        wait(0.1)
        firetouchinterest(playerHead, v.Parent, 1)
        break;
    end
end