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Discussion Starter #1
Recently talked with one of principals at TangoDown. He was just back from FN after working on the prototypes for new magazines for the system. These are PRE-production. FYI.





In terms of exact materials, this is not the final version; however, the multi piece construction and gasket will be present.
 

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Thanx Erick, here is an interesting discussion on TangoDown's SCAR mag:

http://lightfighter.net/eve/forums/a/tpc/f/7206084761/m/2681058363 (requires registration)

Our design goal when we initially began this project about 3 years ago was to produce a polymer mag that had enhanced reliability, modularity for different ammunition capacities and competitive per-unit cost for the SCAR program.

We will be initially producing 2 calibers, 5.56x45mm and 7.62x51mm for both FN SCAR light and heavy weapons.

For enhanced reliability, we chose sealing the mag from the environment as much as possible, deleting the floorplate. A by-product of that
was tremendous strength exhibited by the 5 sided box construction in FEA studies. Cleaning the magazine is easy, requiring no disassembly. Compressed air or water jet through the slots in the follower while the magazine is upside down will remove any debris. We do have a Maritime version that has a one way drain valve for OTB operations.

The two-piece housing assembly allows us to use optimum ammunition 'stack' in the design. We can tightly control the molding process at the same time, as we are making 2 small shots instead of one long one. Material freeze off is no longer an issue. The industrial adhesive we use to join the 2 halves exceeds the strength of the base material. Additional benefit is that we can mold the entire lower half of the magazine in a transparent/translucent material for ammunition viewing, keeping the superior strength reinforced material up top for the feedlips, etc.

The 'gasket' between magwell and magazine is actually a soft durometer silicone seal that is bonded to the magazine. It can't shift or migrate on the magazine body. We used a foam seal at the Show for demonstration purposes. A specific type of magazine carrier design is underway, to answer that question. It will be trick.

In all the studies we researched, the primary mechanical cause of magazine failure to feed was due to feedlip issues. Springs and followers were down the list. By using a high quality coated spring, our sealed design would need to be replaced only when the lips were worn out and/ or damaged.

The follower is pretty novel, and is driven differently than existing baseline G.I.-type followers

The comprehensive testing and documentation will be done by DoD, and we will not release this product commercially or otherwise until it is ready to go. We are seeking the next level of small arm magazine performance.
 

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Those look and sound nice. I was intitially wondering if the 2-part mag body would allow for changing the capacity by installing a new lower section and spring, but it looks like they are bonded together really good, which is probably a better idea-you wouldn't want mags falling apart in the heat of battle.
 

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They said they will use a silicone seal, not a foam one like they did at the shotshow.

Read:
The industrial adhesive we use to join the 2 halves exceeds the strength of the base material. Additional benefit is that we can mold the entire lower half of the magazine in a transparent/translucent material for ammunition viewing, keeping the superior strength reinforced material up top for the feedlips, etc.

The 'gasket' between magwell and magazine is actually a soft durometer silicone seal that is bonded to the magazine. It can't shift or migrate on the magazine body. We used a foam seal at the Show for demonstration purposes.
I may be reading it wrong, but to me it sounds like they will be stuck together pretty well.
 

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DSArms will be making new FAL magazines (20, 25, & 30 round) with a conspicuous AR-type square opening on the side...

http://www.ar15.com/forums/topic.html?b=2&f=319&t=165872

...Hmmm, SCAR-H capability? :?


***

More on the TangoDown Mag:

http://www.thefirearmblog.com/blog/2008/12/10/new-tangodown-arc-ar-15-magazine/


EDIT TO ADD:

Tangodown ARC magazine test-1

M4 Mag Test.mp4

Pic of SCAR-L with TangoDown mag (Chen Lee):
http://photos.imageevent.com/smglee/clt2/huge/FN SCAR Mag Test of 6.13.08 005.jpg
 

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Discussion Starter #10
Jeff & crew didn't develop this on their own. It is the result of a request from the actual end users, based on environmental and other issues. There is a reason for its existance.

A non-Mil and decent, normal human version(s) will be available without the lip and seal.
 
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