MagPul Industries Developing 4×2 Quad Stack Magazine (5.56mm NATO): Enhanced-Capacity AR Mag (4179 STANAG)

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 separates two dual staggered round stacks. Two springs are used, a lower stronger spring and a weaker top spring, which are joined by spring slicer.

The magazine has a constant curve geometry. Interestingly, the transition area (16) is asymmetric in order to stagger rounds correctly.

The follower is very interesting. Two bails (58a and 58b) are spring loaded. When the follower is pushed against the central partition they part and reveal a hole which allows the follower to descend below the partition.

The Firearm Blog estimates the magazine’s capacity at approximately 50 rounds, and deems it “ideal” for the USMC’s HK M27 IAR (Infantry Automatic Rifle).

MagPul’s quad-stack mag patent application follows Iszmash’s announcement that one of the major features of the AK-200 rifle/carbine/SBR will be a 60-shot quad-stack mag.

Company Contact Info:

MagPul Industries Corp.
PO Box 17697
Longmont, Colorado 80308-0697
877-4MAGPUL (877-462-4785) Toll-Free Office
303-828-3460 Office
303-828-3469 Fax
orders@magpul.com Customer Service/Orders Email
magpul@magpul.com General Email
http://www.magpul.com Website

DUNS # 076925788

CAGE# 1LX50

Hat Tip: The Firearm Blog

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