By David Crane defrev (at) gmail (dot) com June 8, 2010 And, speaking of enhanced-capacity 5.56x45mm NATO (5.56mm NATO)/.223 Rem. 4179 STANAG AR (AR-15) magazines, MagPul Industries has just filed a patent application (#: 20100126053) for a quad stack 4×2 AR mag. Here’s how The Firearm Blog describes the magazine’s operation: The design is quite straight forward. A central partition …

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