I bought a Galco "Deep Undercover" which translates into deep into you sides when worn. Damn uncomfortable for my big rear end.
Of course thats because I have a IWB MS VMII, that takes up some real estate. I carry my spares in a Blade-Tech combo light/mag holder.
Maybe the skinny guys can chime in-to me IWB mag pouch

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Why is it that you always find things at the last place you looked?
Because when you find something-you stop looking-Mooch