Is there a way to make a player forced to R6?

If i was using a R6 & R15 game is there a way i could change there rigtype without tem dying and being the same rig type as before. Ex: If im R6 and run this

game.Players.LocalPlayer.Character.RigType = "R15"

I will simply die and still be R6

This is not even located in Studio.

When you're publishing your game, you will see your game settings on the Roblox website. It will say "Force R6", "Force R15" and "Player's Choice" (or something like that). Clicking Force R6 forces every player that joins the game to use R6 regardless of whether or not they have their avatar already set to R6. Force R15 forces players to use R15 regardless if they have an R6, R15 or R-Thro package on. Player's Choice will set their animation to whatever one they already have on (R-Thro can only be accessed through this option). That's it.

But, in your case, you could do this:

game.Players.PlayerAdded:Connect(function(p)
	p.CharacterAdded:Connect(function()
		if p.Character.Humanoid.RigType == Enum.HumanoidRigType.R15 then
			p.Character.Humanoid.RigType = "R6" -- I could be wrong, you could do Enum.HumanoidRigType.R6 if this doesn't work
		end
	end)
end)