How do I call on a player in a regular script?

I'm making this script for testing and I'm having trouble figuring out how to check if the player is in group and team, but not when they joined the game.

local weapon = game.Lighting:FindFirstChild("M3 Grease Gun")

game.Players.PlayerAdded:connect(function(player)
	if player:IsInGroup(4057855, 4057998) then
		if player.TeamColor == BrickColor.new("Bright red") then
		weapon:clone().Parent = player.Backpack
	end
end
end)

Try this:

local weapon = game.Lighting:FindFirstChild("M3 Grease Gun")

game.Players.PlayerAdded:connect(function(player)
    if player:IsInGroup(4057855) or player:IsInGroup(4057998) then
        if player.TeamColor == BrickColor.new("Bright red") then
        weapon:clone().Parent = player.Backpack
    end
end
end)