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These magazines are modified factory AI AW magazines adapted to use the Area 419 extension to safely fit 13 rounds - you’ll notice that unlike some other designs the bottom of the mag is now level rather than angled. 14 rounds can be stuffed into the magazine and still function, but is harsher on the spring and geometry looks to be less ideal.These were made for me by another member; the process involves irrevocably modifying the factory magazine body so these must be used as seen there is no going back. Tested to feed with .308 Win and 6.5 CM, profiled to fit MDT’s ACC Elite chassis and M5 Precision DBM. Fed in my Coup de Grace without issue, buttery smooth. All have been tested for function, though clearly one has a few more cycles on it. Can’t guarantee they work with shorter rounds or other chassis/DBM models due to latch design etc.