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or instead get the 551-A1 which uses sig mags which are of an AK type, which are more reliable for a couple reasons, first by having a fully curved profile to match the taper of the cartridges, and second by using leverage to lock the mag in place... third advantage to the 551 using the original style magazines is you wouldnt need a long skinny neck on c-mags and drums, theyd fit much closer to the receiver
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