My bad...I misread his desire for pistol mag pouches as for a pistol holster. Oops....reading is fundamental, TimW.
Most double-pistol mag pouches only take up 2 columns, so there's still a chance, depending on how much overlap, if any, the M4 pouches take up.
An alternative would be for him to use two of the double High Speed Gear Universal Modular Mag Pouch (UMMP). Each pocket will hold 3 mags, so 6 mags for each double pouch = 12 mags total. They take up only 4 PALS columns and there's hardly any overlap/extension beyond the edge. This would leave 6 columns open.
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