[QUOTE=Ibby;624178]CA and TOP box mags are compatible. Don't know about the rest. A really kick ass box mag design uses a real steel box mag and an internal system you build yourself. The instructions are on Guarder's website. You can easily have 3000 rounds in the mag.
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i can't find this mag anywhere. as for reliablity anyone know of a good working box mag? i may have to hardwire the trigger harness with my box mag for better feeding
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