It means rather than having your ammo all in a neat one on top of the other line the ammo is the mag is staggered into two somewhat loose stacks allowing for more ammo capacity. Look at a 1911 mag and a Glock or other higher cal mags. It's pretty easy to tell he difference. A double stack mag it wider and some smaller hands have issues with a good or as comfortable grip on them due to that.

Double the pleasure, double the fun!!

If your like me and have to see to understand, here's a pic of a Glock double stack that might help:

http://www.concealed-carry-guide.com.../magazin_e.jpg

And here's a side by side of a double stack and a single stack:

http://media.photobucket.com/image/s...s/1c8109ad.jpg

Thanks

Two all beef patties....and if you add the special sauce, and an extra piece of bread you will have a Big Mac!!

I was waiting on that answer, Mike. You forgot to say that it is on the dollar menu.LOL

Hmmph. And all this time I figured it was twice the pancakes.