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No, some players do that - either for "buddy mags" (mags for team mates) or to have accessible mags when prone.
HOWEVER, if you're setting it up for yourself you'll want to be careful how you do it: it can be very difficult getting a mag out from a pouch behind you (twist your arm), specially if you have plates or a bulky armor system on.
On my RRV I have a single tactical (open top w/ bungie cord retention) mag pouch, which is mounted upside down. The bungie cord and pouch cinch hold the mag well enough that it doesn't just drop out, and I can retrieve it by pulling down rather than upwards so I'm not twisting my arm.
You may also want to consider mounting some mag pouched on a MOLLE leg platform.
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