![Bild](http://img716.imageshack.us/img716/3854/tmpmagpulquadmagazinetf.jpg)
The design is quite straight forward. A central partition separates two duel 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.
![Bild](http://img716.imageshack.us/img716/7172/tmpfollowertfb.jpg)
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 patent does not reveal what the capacity of the magazine would be. I would expect it would be around 50 rounds.
The patent application comes on the heel of the announcement from Izmash that one of the major features of the AK-200 will be a 60 round quad stack magazine. It seems 2010 or 2011 may be the Year of the Quad Stack Mag!
A quad stack magazine would be ideal for the M27 IAR. I have no doubt that Magpul will eyeing a lucrative contract with the USMC.