F to pick up Guns not working on some guns?

Hi, i have a script that i push F to pick up a weapon and clone it to the backpack so i can equip it. I am currently using some gun models as a substitute for a while and when i push f on some weapons it will equip that weapon, but sometimes i pick up a gun and it wont equip the weapon but the weapon tool shows in game where it is positioned. (sorry if this isn't making sense). I have all my tools in the lightning space, and a part which looks exactly like the gun. where the tool is placed the tool will become visible when equipped. but the thing is if i use a click detector it works perfect. Any help is appreciated thanks :)

Model used - https://www.roblox.com/library/2273555208/PF-Gun-Pack-FE-SCRIPT-INCLUDED

My script(half from a youtube tutorial some from me):

local tools = {MP5 = true, Pistol = true, RoboRifle = true, UMP45 = true, SKS = true, GLOCK18 = true}
local radius = 10
local removeToolUponPickUp = true
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local running = false
local found
function getTools()
	local found = {}
	for i, c in pairs(game.Workspace.Weapons:GetChildren()) do
		if tools[c.Name] then
			table.insert(found, c)
		end
	end
	return found
end
function walking(speed)
	running = speed > 0 and true or false
	while running and not found do
		for i, tool in pairs(getTools()) do
			local pos = tool:GetModelCFrame().p
			if player:DistanceFromCharacter(pos) < radius then
				found = true
				local WSP = game.Workspace.CurrentCamera:WorldToScreenPoint(pos) -- The position of the WeaponsCFRAME
            	script.Parent.Visible = true
           	 	script.Parent.Position = UDim2.new(0,WSP.X,0,WSP.Y)
				script.Parent.TextLabel.Text = "press F to pick up " ..tool.Name
				found = tool
				while true do
					if player:DistanceFromCharacter(pos) > radius then
						script.Parent.Visible = false
						found = nil
						break
					end
					wait(0.25)
				end
			end
		end
		wait(0.25)
	end
end
mouse.KeyDown:connect(function(key)
	if key:lower() == "f" and found then
		local tool = game.Lighting[found.Name]:Clone()
		tool.Parent = player.Backpack
		script.Parent.Visible = false
		if removeToolUponPickUp then
			found:Destroy()
		end
		found = nil
	end
end)
repeat
	wait()
until player.Character
wait(0.5)
player.Character.Humanoid.Running:connect(walking)