RayCast passes right through rig that isnt blacklisted

Help and Feedback Scripting Support
#1

i made a simple raycast but sometimes when I click on objects the ray gous right through them.

code:

local plr = game.Players.LocalPlayer
local tool = script.Parent
local block = tool.gun
local mouse = plr:GetMouse()
local event = game.ReplicatedStorage.shoot

function inviswall(x, a, b) --x = hierarchy to search; a = transparency; b = cancollide
	for i,v in pairs(x:GetChildren()) do
		if v:IsA("Part") then
			if v.Transparency == a and v.CanCollide == b then
				return v
			end
		end
	end
end

function getkids(a)
	for i,v in pairs(a:GetChildren()) do
		return v
	end
end

local gun = getkids(tool)

local inviswalls = inviswall(workspace, 1, true)

print(inviswalls)

local function shoot()
	local direction = (mouse.hit.Position - block.Position) * 9000
	local rayparams = RaycastParams.new()
	rayparams.FilterDescendantsInstances = {inviswalls, gun}
	rayparams.FilterType = Enum.RaycastFilterType.Exclude
	local ray = workspace:Raycast(block.Position, direction, rayparams)
	print(ray)
end

tool.Activated:Connect(function()
	shoot()
end)