"Make me a realistic gun"

-- server script
local RunService = game:GetService("RunService")
local Players = game:GetService("Players")

local npc = script.Parent
local rootPart = npc.HumanoidRootPart
local humanoid = npc.Humanoid

rootPart.Touched:Connect(function(hit)
    local player = Players:GetPlayerFromCharacter(hit.Parent) -- find the player

if player then -- check if the player was found
        player.Character.Humanoid.Health = 0 -- damage the player
    end
end)

while true do
    for _, player in pairs(Players:GetPlayers()) do -- loop through all the players
        local playerRoot = player.Character and player.Character:FindFirstChild("HumanoidRootPart") -- get the player's humanoidrootpart

if playerRoot and (playerRoot.Position - rootPart.Position).Magnitude <= 25 then -- check if the player is near the npc
            humanoid:MoveTo(player.Character.HumanoidRootPart.Position) -- move the npc
            humanoid.MoveToFinished:Wait() -- wait until the npc has reached the player (not sure if i should use movetofinished)
            break -- break the loop so it doesn't follow a different player
        end
    end

RunService.Heartbeat:Wait() -- in case no player is near the npc
end)