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First, he should carry in an IWB that has the belt loops on each side of the holster (as per the photos posted above). These have a thinner profile than IWB's that have the belt loops on the main body of the holster.
Second, have him get a pair of thin grips. Check out Esmeralda, ahrends, VZ, and other craftsmen. The thin grips will take about 1/8 of an inch off the width of grip.
My .02 ... good luck!
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