Will any AR-15 multi tool work for the JR Carbine?

I have a multi-tool that I bought that fits the castle nut for sure. IN the end I just ordered the tool from JRC as I know that one fits.
 
....a thousand dollar carbine doesn't come with the tool that is necessary to do the basic field strip and clean??
 
So why do you guys need the tool then, if not to takedown for cleaning?

Didn't mean to touch anyone's butt nerve. I'm looking at one of these.

And even my mid range 1911 came with a bushing wrench
 
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