If it's feed lips are about the width of the mag opening in the bottom of the receiver, it's staggerfeed. If the feed lips are about as wide apart as the cartridge's diameter, then it's centerfeed. The centerfeed mag is attached to the stock, whereas the staggerfeed is attached to the action. The centerfeed feeds cartridges straight up in the center of the receiver; staggerfeed does what it implies.
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