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http://m4carbine.net/showthread.php?p=6 ... post676804
appears a patent was filed for a quad stack magazine. Follower is variable geometry which folds out when in the quad stack portion of the mag and folds back in in the double stack portion. Wonder how this will turn out. Speculated that it holds 50 rounds. If it works good, might be fun to have a couple
http://www.thefirearmblog.com/blog/2010/06/08/magpuls-quad-stack-magazine/
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