Ive always ran whatever the largest I could get in the rear, with a medium up front. Anything larger up front impedes forward arm movement, shooting a pistol I couldnt get my elbows locked. As for the larger rear plate, I started doing it in 03-04' because it helped my back on those 2 day trips back and forth to Kuwait in a 5 ton seat. Never had an issue with the rear plate impeding movement.
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