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Problem with couplers is the rounds in the sapre mag typically get disloged by recoil, and also are out in the open so they accumulate dirt and other crap.
Never had a round in a coupled mag dislodged by the slight recoil of a .556.
Coupled mags in pouches seem to be faster than redi-mags on the gun in 3 gun matches. You have to check them for dirt after they are dumped on the ground. For the score advantage its worth it.
For combat a ready mag is the answer because of the dirt problem.