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The mag holder you suggested would work great with or without mag in the holder. I would want mine mounted so the rear portion of the mag holder extends beyond the extension tube. That way if it incidently bumped my shoulder it would be more comfortable than being bumped by the bare extension tube. You may be able to pad the exterior of the mag carrier to make it comfortable for a cheek weld.Except that what we were discussing was no "shoulder interface" on the backplane and the mags pointing the other way. Maybe start with a cheekrest as the "saddle" the mag pouches mount on...
I have one of those carriers mounted on the left-sie handguard on my Mk 18, a 40rd PMAG nestles in very nicely with an A5 buffer tube and SBM4.